TROND Bluetooth V5.0 Transmitter Receiver, 2-in-1 Wireless 3.5mm Audio Adapter, AptX Low Latency, Smart Codec Indicator, 2 Devices Simultaneously, for TV, iPod, Home Sound System

There appears to be a lot of confusion about the various Bluetooth transmitter/receiver products and what they can and cannot do, and what is required to get the benefits of advances in Bluetooth technology. To clarify, there are currently three ‘flavors’ of music quality audio Bluetooth- A2DP, AptX and AptX LL. A2DP is standard Bluetooth that most cell phones, computers, wireless headphones and speakers use. It is serviceable with decent audio quality but up to ½ second of delay. When just listening to music, the delay doesn’t matter, but for watching TV it can be annoying, leading to a batter hitting a ball and the sound coming a beat later, or messing the sync of lips with the words they’re saying. AptX has been around for a while as a higher quality version of Bluetooth audio, with better sound quality and less delay, but relatively few devices support it and it still has a delay of roughly 1-2 tenths of a second. Better than A2DP, and good enough for people who aren’t as sensitive to the delay. But obvious and annoying when the TV sound is on (for people in the room), while someone is listening through wireless headphones. So the AptX people developed AptX LL, standing for ‘Low Latency’, a fancy term for low delay. AptX LL delay can be as low as 40 milliseconds (less than half of a tenth of a second), and for TV watching, is almost undetectable. In order to benefit from AptX LL however, you need a source that is transmitting it and a headphone or speaker that is receiving and reproducing it. This is where I think a lot of negative reviews are coming from- if you don’t have AptX LL at both ends, you won’t get any benefit. Since there are only a handful of AptX LL headphones, and no TV or hifi manufacturers have adopted it yet, miniature devices like the DUO S are designed to let the vast majority of existing audio devices take advantage of this technology. The Trond Duo S provides the most advanced Bluetooth audio experience currently available, and I am very happy with its performance. I bought it specifically to obtain satisfactory wireless headphone listening to my Sony XBR TV. When connected to a continuous source of power via the microsd port, it pairs almost instantly when I turn my headphones on (note many TV’s kill the power to their USB ports when they are turned off, and the Trond will shut off after some time to save the battery, and then need to be turned back on and re-paired when the TV is turned back on, so I would recommend using an old phone charger to power it). I’m using the Avantree Audition Pro, one of the only headphones on the market with AptX LL built in, and the sound is excellent, with negligible delay. The DUO S can also act as a receiver, to turn any pair of headphones with an ⅛” jack into AptX LL wireless headphones, but of course you need two of the DUO’s, one transmitting from the TV or other device and one connected to the headphones. Finally, I must comment on Trond customer service. This has been by far the most responsive company I’ve done business with in the internet age. We’re talking a $40 device from China. I was not expecting much when I emailed them a question. And yet I have experienced a level of communication that would make Apple envious. My emails were responded to promptly, in detail, by individuals with excellent spelling and grammar who clearly want my experience to be as positive as possible. I originally had some issues with getting the LL version of AptX working with my Avantree Audition Pro’s, and instead of blaming the other company, Trond bent over backwards to get to the bottom of the issue and offer solutions. So 5 stars for Trond customer service as well as the DUO S.

I have one hooked up to as a transmitter near my PC & projector, and one 25 feet away as a receiver near my Audio Receiver. My audio receiver is current, is bluetooth enabled, and is a high end system, but this product responds better. The sound is as beautiful as if it is hard-wired (still). I do not use the battery life for my Audio Receiver setup. I have, but prefer to keep it continuously powered-in so I do no need to deal with the inconvenience of re-charging or swapping for a new pair, then pairing again. The two send / receive gadgets have been paired all this time, fully charged and never failed. Both are always stationary. If I power down my projector, Audio Receiver, PC, TV signal source, etc., I leave this device powered-in and paired 100% of the time. This device has saved me a huge amount of time and effort avoiding the hard-wiring of speaker wire. If there is any delay of sound, I have never noticed it. If that happens I am confident it is a broadcast or recording issue - it has never been the fault of this device. I don't know why I have never reviewed this before - I cannot say enough positive things about the quality and simplicity of use. I have tried several other such gadgets and thought I would never find one like what I have now. I also have a pair of very high-end headphones, 3.5 sound jack only. I rigged a second sound outlet to broadcast sound and, with a couple of adapters, wirelessly receive that sound to my headphones (TV watching oriented, not an exercise compatible headset). My headset does not a volume control so the fact that this thing has a volume control is a real gift. The send / receive is a 2nd set of this device - which I do pair each time, and I do use the battery on the receive end. I have never looked up the projected battery life, as they have never died on me. So, I just recharge them when I am done. The sound is just as excellent. With this setup I use them to watch TV so as not to bug the neighbors at night and, therefore, there is not much moving around watching TV, Netflix or whatever. I do have to say that when I do move around, sometimes there is a bit of a temporary sound / bluetooth connection issue such that I have to watch what the receiving side of the gadget is doing. There seems to be either a line-of-sight or stationary requirement, or both. But considering all of the positives, I can live with that. I have not found anything better that allows me to use full quality of sound in my preferred systems, nor have I felt the need to look since I found this device. It is miles above any other device I have tried.

This device is small and easy to operate and pair with other Bluetooth devices. I am using it on a projector as a Bluetooth transmitter for sound. When paired with my JBL Charge 3 it works great. There is no noticeable lag at all. However, when paired with my Denon home theater receiver, there is about a 4-5 second lag with the sound. Not exactly sure why this is, but I did buy this to use with my home theater system and it doesn't work with that. I'm keeping it though because until I can afford a descent wireless HDMI system, the sound from the Bluetooth speaker is far superior to that of the built in speakers in the projector.

I bought this tiny device to aid in me hearing the television without blowing the spouse out of the room. Let's just say my hearing is not what it once was. I opened the box and took the transmitter out. It's small (roughly 1 1/2" x 2" x 1/4"). I have RCA audio out jacks on the back of my Panasonic 57" tv and the device comes with the cable to connect to them. I plugged int the RCA jacks and then to the DUO. I followed the step to switch device to TRANSMIT and then plugged in the power cord. If you are using a set of bluetooth headphones you simply pair them to the DUO. But I wanted to use a set of JBL (non-bluetooth) ear buds so I also bought the Trond duo receiver only version. I followed the simple two-step instructions to pair the two and in 30 seconds it was done. I then plugged my ear buds into the receiver. There are buttons on the side to power down the devices but I leave both plugged into power full time so I can't comment on battery life. But as far as working seamlessly and flawlessly since install. I give these premium marks for doing exactly what they say they will perfectly. There is no latency that I can detect. I use these daily and cannot recommend them more highly at least the purpose I use them for. An added benefit is the receiver has a volume control. This means you control your volume independently of the TV. She can listen at a low volume that doesn't work for me and I can play it louder to the headset. OR she can be in another room reading and I can mute the TV surround sound and listen at any volume I want without bothering her. Example: she really does not like The Walking Dead. She especially does not like The Walking Dead audio track. So its not just a matter of her being in another room. So I just mute the tv and and adjust my own sound that she can't hear. Just so you know: The tv I used has RCA out jacks and no headphone jack. No problem because the device comes with the RCA connecting cable. But, I was thinking about duplicating this setup again for the master bedroom. BUT that TV has neither RCA jacks nor a headphone jack. But it does have digital optical out. Apparently this is the case with all Samsung TVs So if you want to use these transmitter/receiver devices with a TV with ONLY optical digital out you will need a Digital to Analog adapter box which are available from Amazon. UPDATE: The two Trond products I bought (the 4.1 & 4.2 transmitter/receivers) have worked great until yesterday. The right channel of the 4.1 has ceased working. I wondered after the volume went down slowly, alas it has now stopped in the right channel. Seems rather short for electronics to last 10 months. Will see what happens when I contact Trond Official.

Works well once connected. However two issues I've noticed. First, if your tv doesn't have either a headphone jack or dual RCA speaker output (my fairly new plasma only has a digital optical audio out which is already being used by my Bose sound bar) you are out of luck hooking directly to your TV. I was able to connect to my Direct TV box which has a digital audio cable port and then luckily I had a converter box to go from that to an RCA female port which I then plugged this device. Second was an issue with pairing with my Bluetooth headset. I can pair but once I turn off the headsets they don't automatically reconnect and I have to re pair the headsets. It's happened with two different headsets. So not sure what the issue is. Other than those issue this device works really well. Great sound. No lag.

Review of the following two items purchased together: Tx/Rx: TROND Bluetooth V4.1 Transmitter Receiver / Wireless 3.5mm Audio Adapter with aptX Low Latency & aptX for Both TX & RX, Dual Stream and Volume Controller Rx: TROND 3.5mm Bluetooth V4.2 Audio Receiver Adapter with AptX Low Latency & Volume Control, for Home Stereo, Wired Headphones & Speakers Both are 5 stars IMO. Here’s what I was looking for and what I found: Main objective: Use a BT receiver to allow me to use wired high quality headphones (Sennheiser HD650, HD598, HD555 mod to 595) with BT enabled devices (TV, computers, iPhone 7+, iPods and iPads) and secondary objective of using wired headphones with non-BT enabled legacy devices (iPod classic, older TVs) Why? Good quality BT enabled headphones are expensive and have a limited frequency range (Bose QC35 $349, and Sennheiser HD-1 Wireless $499, 28 ohm impedance, 16-22000 Hz) compared to higher quality headsets (Sennheiser HD650 300 ohm impedance, 10-41000Hz; HD598 50 ohm, 12-38,500 Hz, HD280 64 ohm, 8-25000 Hz). Even though BT has improved up to BT 4.2 and codecs for sound transmission have improved to decrease latency and transmit a broader range of frequencies, it is still cheaper to convert wired headset to BT capability at the inconvenience of managing a dangling cable. I don’t expect the BT transmission to have the same quality as a headphone wired directly to a receiver or iPhone/iPod/iPad Why did I purchase both? a. Reviews of many bluetooth (BT) receivers (Rx) used to drive headphones reported lag between video and audio. I wanted the receiver, but if there was going to be lag, then I’d pair the Rx/Tx with the Rx to see if that helped. I looked for low latency drivers. b. For non-BT devices (old iPod classic, non BT TV, I needed a BT Tx, so a combo Rx/Tx made sense. What features were I looking for? a. Volume control on the Rx. Why? because the wired headphones don’t have volume control unless I put a volume control between them and the Rx. Samsung Series 6 600D and Series 7 700D UHDTVs with BT don’t provide volume control using the TV remote; therefore the receiving end of the BT Rx has to control the volume. b. Most up to date BT 4.1 or 4.2 so that it maintains backwards compatibility with other BT units (not all BT are the same — i.e. my iPhone 7+ can pair to a Jaybird Freedom, but my iWatch series 2 won’t pair with the Jaybird Freedom). My intended uses: 1. Pair Bluetooth TV to Rx connected to headphone, if there is latency, then connect Rx/Tx to TV RCA outs and pair Rx/Tx to Rx connected to headphone 2. Pair iPads/iPhone/iPod blue tooth to Rx/Tx in Rx mode or Rx connected to headphone 3. Pair Rx/Tx to Rx connected to headphone DESIGN. Both have the same small form factor, plastic box except the Rx has an on off sliding switch rather than just a single button that has to be held 3 seconds to turn it on. Rx/Tx no sliding on off switch, just a button that has to be held down 3 seconds. EASE OF CONNECTION: Charged both fully. Tx/Rx set to Tx and turned on, Rx turned on 1st time and they paired within 5-10 seconds. Tx/Rx goes to solid blue; Rx goes to LED off blinking blue every 10 seconds instead of solid blue to indicate connection. No I can connect any nonBT device (TV, older iPods, iPod Classic) via male to male 1/8” plug to the Tx/Rx set to Tx mode and headphone connected to Rx and I have a functioning BT system. I just wrap the headphone cords up with velcro and put it on one side of the headband … looks geeky but I’m using it for function, not looks. To set either unit to pair, just double tap the “power button” and they immediately blink red blue red blue until paired. Once paired, Tx/Rx light goes to solid blue, Rx blinks blue every 10 seconds. Even if a connection is active, the double tap “power button” breaks the connection and sets the units to pair mode. Pairing is quick. Pairing to Samsung 600D, 700D UHDTV is easy. Go to Menu Settings > Audio > Select Speaker > Bluetooth. The Trond unit will show up no screen, select pair and it’s done in 5 seconds. Volume control is on the Trond unit; Samsung remote cannot control volume from TV. NO LATENCY on both TVs to Rx/Tx or Rx. Very nice. Don’t need to implement the Rx/Tx —> Rx method. This gives me a BT Rx for each TV now. Caveat, iWatch series 2 cannot pair to either Trond Rx/Tx set to Rx mode or Trond Rx. But iWatch series 2 cannot pair to Jaybird Freedom BT earphone. iPhone 7+ pairs to Tronds and Jaybird Freedom BT and work without problems. This seems to be more of a problem with the iWatch than the Trond units. DROP OFFS and DISTANCE: Connection good to HDTV BT 30 feet away unobstructed. No drops offs of signal or loss of connection with iPhone in pants pocket and received on opposite side of my head indoors. Haven’t tested outdoors where BT can’t bounce off walls. Intermittent breakup when BT Rx separated from BT Tx by a floor (i.e. receiver on 1st floor, Tx in basement, but of course it gets better when I’m standing 1 floor immediately above the Tx in the basement). If paired to iPhone 7+ and I turn on the car to which the 7+ is paired, the Trond connection shuts off and the car and 7+ become paired to give priority to car-phone handsfree connection. Trond doesn’t have a speaker and can’t be used for answering calls (which is not what I got this for). SOUND QUALITY: No lag from Samsung UHDTV Series 6 and Series 7 using the TVs BT. No audio-video lag between TV and Trond Rx, iPad and Trond Rx playing movies on Amazon Prime and Youtube. Sound quality depends upon type of headphone connected to Rx, but the Rx and Rx/Tx can both drive a 300 ohm impedance Sennheiser HD650 without problem. (Avantree Quick Clip reportedly has a hiss and can’t drive anything more than 32 ohm from what I’ve seen on reviews on Amazon). The sound quality (frequency spread) is not as wide as wiring the HD650 directly to my iPod classic, but it’s almost as good (i.e. like listening to an MP3 at 320 kbps instead of a lossless MP4/M4A at up to 1444 kbps sampling). I use MP4 lossless music files as I can hear the difference in quality between 1444 kbps sampling MP4/WAV and MP3 320 kbps max. I am very satisfied with the BT performance from iPhone 7+ to Trond Rx to HD650, and iPod Classic to Trond Rx/Tx to Trond Rx to HD650. Even though reviews say an HD650 is best used with an external amp, I have been more than satisfied with the performance with an un-ampped HD650 driven by an iPod classic or iPhone 7+ lightning to 1/8” plug given the type of recordings I use (which are much better than the 128 kbps stuff found off of iTunes music store … the stuff that many are satisfied using less refined headsets and earbuds). Works just fine with the other HD598, HD 555 mod to HD 595, so it should work just fine with anything lesser. Even the slightly truncated sound of the Tx/Rx to HD650 is still better than any of the other headsets. Wired is always better than BT, but BT is getting close. Other specs: HD280 8-25000 Hz, 64 ohm impedance HD555 12-38599 Hz HD598 12-38500 Hz, 50 ohm HD650 10-39500 Hz, 300 ohm HD1 16-22000 Hz, 28 ohm; this is Sennheiser’s $499 BT headset Bose QC35 $349, QC2, QC3 — I can’t find specs on these, but the Trond’s drive my QC3 just fine. Haven’t tested QC2 and of course the QC35 doesn’t need this. In general, Bose headphones tend to muddy the mids and are thus more bass heavy than balanced headphones. Sennheiser HD700 8-44000 Hz, 150 ohm, $419 Sennheiser HD800 19-44900 Hz, 300 ohm, $990 I’d rather spend my money on an HD700 than on the $499 HD1, so the Trond BT are a workable solution for me. If they can drive the HD650, I’d anticipate it should do just as well with an HD700. Things I haven’t tested: I haven’t tried the Rx/Tx bind to two Rx to drive two headphones, but this is what would be needed to drive 2 headsets from one TV. I haven’t tested how week the signal would get from an Rx connected to a 1/8” splitter to drive two headsets. FINAL THOUGHTS: 1. Trond Rx/Tx and Rx are both 5 star. 2. BT pairing is easy, quick and simple. 3. No lag between audio and video from Samsung UHDTV BT to either Trond unit. 4. Trond Rx able to drive 300 ohm Senheisser HD650 without hiss 5. Less cost than the Avantree Quick Clipper Pro and Priva III (which I considered prior to purchasing these). Reportedly the Clipper can’t drive anything >32ohm per specs. If you don’t need a BT Tx, then I’d just buy the $20 Trond BT Rx. If you want flexibility, then get the Trond BT Rx/Tx with volume control which are $37 as of 3/20/2017. Even though iPhone and iPod Classic can control the volume transmitted to the Rx, the Samsung TVs don’t; therefore, I wouldn't get the BT Rx/Tx without volume control or volume at the headset will be loud unless you put a volume control between the Rx and the headset plug. 3/24/2017 Update: I liked these so much, I bought another pair of Tx/Rx and Rx. Amazon had a lightning deal on the Tx/Rx for around $25. Great deal. To get them to initially pair, make sure no other BT devices are on. I couldn't get them to pair initially when my BT Samsung UHDTV was on because the TV seems to automatically pair to devices like this. Once I turned off the TV, I could get the Rx/Tx to pair to the Rx. After that, pairing was quick as long as the two were in near contact with each other though other BT devices were on. Update: 4/10/2017 When using these with a sensitive, low impedence in ear monitor -- Shure PTH500/530, there is background noise when played at low levels; the Shure can play really loud at a lower volume setting than >50ohm impedance headphones (i.e. No low level noise using Sennheiser HD280 (64 ohm), HD 555/598 (50 ohm), HD 700 (150 ohm), and HD 650 (300 ohm). Paired to Samsung Series 6/7 UHDTVs as well has headphone output on a Yamaha RX-3060 receiver running a connected BluRay, I find no lag between audio and visual, even after putting the movie through various digital signal processes on the Yamaha.

This is an update to my earlier review. I'm downgrading this from a 5 star to a 1 star for two reasons. First: the unit I have now is a replacement, under warranty, from the manufacturer because as noted in my original review the first unit stopped pairing with my BT transmitter. Well now this replacement unit has stopped pairing. Second: As other reviewers have noted, when the battery on this unit is low it blasts a tone that is unnecessarily loud and unnerving. Original Review: In January of this year I purchased a Trond BT-Duo S Transmitter & Receiver and a Trond BT-RX S Receiver. I connected the BT-Duo S, in trasmitter mode, to my 15 +/- year old Niles Audio ZR 4630 multizone amp/receiver; primarily for TV and internet radio sound. I connected the Bt-RX S to my Klipsch earbuds. Everything paired and worked fine. The only problem I had with the setup was the transmit distance, didn't reach all rooms or my balcony. These devices are not marketed as long range, and I knew that. So, in July I purchased an Avantree TC500 Oasis low latency long distance transmitter, repaired both the Trond devices to the Avantree and put the BT-Duo S into receiver mode. Now I had two receivers so one could be in use while one was charging, cool. Everthing worked fine until a couple of weeks ago. The BT-Duo S stopped producesing sound, it was still paired to the Avantree, the Avantree has an audible confirmation of this. After checking the obvious possible problems re-pairing it to the Avantree multiple times, still no sound. I contacted Trond customer care via email, and after a few exchanges within a week I recieved a warrenty replacement; excellent communication and great customer service.

I have been on the hunt for a low latency transceiver and a headset combo. This one fits the bucket. First let me state that the endeavor is more complicated than it seems at fisrt hand. Although bluetooth tries to make it as easy and transparent for the user, not all bluetooth devices are equal. What you want to pay attention to is what codecs are supported by your devices. There are fast codecs and slow codecs, and there are high fidelity codecs and low fidelity codecs. Without going too much into it, the fastest high fidelity codec available today is called AptX-LL. It is an improvement over the older AptX codec, of the same company. So what you want is a transmitter and a headset that both support AptX-LL. AptX alone is not fast enough, mind you, so if anything is AptX only, your bluetooth connection will be noticeably slower. Then, there is the issue that sometimes a certain brand of transmitter and a certain brand of headphones will not connect fast even when both support AptX-LL. This is annoying, but it happens. So you want to try a few headsets with a few transmitters and see which ones work together. And that's what I did. I bought a bunch of transmitters and a bunch of headphones and paired them all to see what would work. In the case of this little device, it worked fine with the following headsets: Premium MS301 Mixcder Wireless & Wired V4.2 Bass Noise Isolation Headphones with aptX Low Latency Audio- Headset with Mic & Bluetooth - Sturdy Foldable - Universal Compatibility for iPhone Tablet PC Avantree Wireless Bluetooth Over Ear Headphones with Mic, LOW LATENCY Fast Audio aptX Headset for Gaming TV PC, 40h Battery Sound - Audition Pro [2 Years Warranty ] Premium MS301 Mixcder Wireless & Wired V4.2 Bass Noise Isolation Headphones with aptX Low Latency Audio- Headset with Mic & Bluetooth - Sturdy Foldable - Universal Compatibility for iPhone Tablet PC And an older version of Plantronics BackBeat Fit Wireless Headphones - Retail Packaging - Green The plantronics FIT headsets are not consistent. If the box says is "sweatproof", the headset will be fast. But if the box says it's "waterproof", it's a newer, improved version of the headset that does not work as fast, for some reason. The newer model phones also failed with other transmitters. Plantronics improved the case and weatherproofing, but made the electronics slower in the process. But that's for another review. It is important to note however that Platronics does not claim to support LL, so no fault on them. In any case, this transmitter is a true low latency transmitter/receiver that works with most of the headsets I bought. The one headset this transmitter did not work with did not state to support low latency, so that was to be expected. You will notice that my list does not include fancier headsets from beats, bose, etc. That is because the higher end manufacturers are being slow to adopt Aptx-LL, for some reason. I have not seen a higher end headset that supports it. Also I was not going to spend $200+ on a headset for this test, to be honest ... Now, if you have a sweetheart headset, do not worry. Buy two of these little guys and set one on your TV as transmitter and the second one on your phones as receiver. They will pair so fast you will think there is still a cable connecting your equipment. Ok maybe not so much but really, the delay will be negligible. Much better than AptX alone. Three times better, not exaggerating. Other than the latency, which was my pet peeve, other aspects of the device make it desirable. The construction seems nice, small and durable. It is light however. And it can run on transmitter mode while connected to a power supply, which is another nice thing. Three buttons (+), (-) and (POWER/PAIR) along with a TX/RX selector make the operation really simple. All in all, this is a low risk purchase, well worth the money if you are trying to improve your video and audio sync. Just be aware of the nuances of bluetooth protocols and nuances, and you will be happy. Non-relevant technical detail: For those of you that want to know, sometimes manufacturers says which chipset they use in their products. A popular chipset that supports AptX-LL is called CSR 8670. If you see products with that chipset, it's a good clue they will support low latency. When I say the chipset mentioned in this page I know these were fast. Another non-relevant technical detail: Latency is measured in thousandths of seconds, or milliseconds. In my experience, anything rated 100mS or more will have a very noticeable delay, and anything rated 30mS or less will give you audio almost right on top of your video. The less the better of course, but at the 30mS mark you will have to pay close attention to notice delay. So you can watch out for that clue, if mentioned, when deciding what to buy. Good luck!

The Trond BlueTooth transmitter with codec AptX Low Latency works perfectly. It is small, Trond Bluetooth v4.1 Transmitter Empfänger/Wireless 3,5 mm Audio-Adapter, mit aptX geringer Latenz sowohl für TX & RX, Dual Stream und Volumen Controller easy to use, battery capacity is good and pairing easy. The synchronisation between screen (lips) and sound is perfect when using it to watch/listen to TV. Of course my Denon AH-GC20 headphone also has the AptX Low Latency codec, I bought the Trond BT v4.1 transmitter because my previous BT transmitter was just not suitable for watching TV. The sound was totally out of synchronisation with the screen.

Oramai siamo circondati di oggetti che utilizzano il bluetooth per fruire dei contenuti audio e video e sempre più spesso si rende necessario permettere a dispositivi non più nuovissimi, di comunicare con i dispositivi wireless. Proprio per questo motivo (rendere Bluetooth il mio vecchio TV e trasmettere l'audio dal mio smartphone al mio Hi-Fi) ho deciso di recensire l'adattatore Bluetooth TROND BT-DUO S, evoluzione del modello precedente, che funge sia da ricevitore che da trasmettitore CONFEZIONE e DESIGN L'adattatore TROND BT-DUO S si presenta con un packaging semplice, molto ben protetto e completo, contenente: - l'adattatore TROND BT-DUO S - Un cavo con ad entrambe le estremità un jack da 3,5mm maschio - Un cavo USB-MicroUSB per la ricarica - Un adattatore RCA-Jack da 2,5mm femmina - Le istruzioni in inglese e la garanzia L'adattatore è in una plastica leggermente gommata che ottimizza il grip e con una banda in alluminio con il logo Trond che la rende molto piacevole da vedere. Sul lato destro troviamo il tasto di accensione/spegnimento, e i tasti per il volume/avanzamento tracce (in base alla lunghezza della pressione sul tasto). La possibilità di regolare il volume e spostarsi tra le tracce è una cosa che ho apprezzato moltissimo. Sul lato sinistro troviamo solo lo switch per usare l'adattatore in modalità ricevitore/trasmettitore Sul lato basso invece troviamo l'ingresso Jack da 3,5mm e l'ingresso MicroUSB per la ricarica. L'adattatore ha una batteria integrata che permette una decina di ore di autonomia. UTILIZZO - Modalità Ricevitore L'utilizzo come ricevitore (ad esempio: trasmettere l'audio dallo smartphone all'impianto hi-fi di casa che non ha il bluetooth) è davvero semplicissimo! Occorrerà collegare l'adattatore al dispositivo che riceverà il segnale (ad esempio all'amplificatore dell'hi-fi) tramite il cavo jack o RCA, accendere l'adattatore, questo entrerà in modalità di pairing e poi accoppiare il dispositivo tramite il device che vogliamo usare per trasmettere (ad esempio lo smartphone). A quel punto potremo godere dell'audio in qualità CD, grazie al supporto del codec APTX-Low Latency (a patto che anche lo smartphone supporti tale codec). UTILIZZO - Modalità Trasmettitore In maniera simile a quanto fatto nella modalità ricevitore, occorrerà effettuare l'accoppiamento. Per procedere collegare l'adattatore al dispositivo da rendere wireless (ad esempio il mio vecchio TV), spostare il selettore su TX, poi prendere il device da accoppiare (nel mio caso le cuffie Bluetooth), accenderlo e metterlo in modalità pairing. A questo punto accendere l'adattatore TROND e tenere premuto il pulsante di accensione per 3 secondi. Quando i due dispositivi saranno accoppiati la luce led blu dell'adattatore smetterà di lampeggiare. Anche in questa occasione non ho avuto nessun problema con i miei dispositivi e tutto si è configurato in pochi secondi. IMPORTANTE: Il dispositivo funziona anche mentre in ricarica, ma occorre collegare il dispositivo alla fonte di carica prima di accenderlo. QUALITA' DEL SUONO Devo dire che la qualità è davvero ottima, ho testato l'adattatore in modalità ricevitore con il mio mini hi-fi Kenwood e con il mio impianto con amplificatore a valvole, tramite il mio Xperia Z3 (che supporta l'APT-X) e la differenza rispetto al CD è semplicemente sul volume (dipende dal telefono) ma il suono ha una ottima dinamica e spazialità, cosa che non avevo mai trovato con altri adattatori Bluetooth. Ovviamente non è un dispositivo per audiofili, ma soddisferà il 90% di chi cerca musica di qualità tramite Bluetooth. Rispetto al mio Tp-Link Bluetooth 4.0 senza APT-X, l'audio è davvero di qualità superiore. Ottima la resa anche in modalità trasmettitore con il mio TV Samsung. Inoltre il Codec Apt-x presente è l'evoluzione più recente ossia quella a Bassa Latenza, che permette di risolvere uno dei classici problemi del bluetooth: quello del ritardo audio. Con questo adattatore infatti non si avranno problemi di fuori sincrono tra video e audio. Ovviamente essendo la latenza molto bassa (40ms) ma non nulla, questo device non può essere utilizzato per scopi professionali (ad esempio da musicisti). CONCLUSIONI Al prezzo al quale è proposto, il TROND BT-DUO S è davvero un ottimo acquisto. Ha lo stesso prezzo di quelli della concorrenza ma offre di più, ovvero la cosa più importante: il miglior codec Bluetooth. PRO - APT-X Low Latency - Tasti volume e gestione tracce - Facilità di utilizzo - Batteria CONTRO - nessuno

Very Fast Despatch. Nice little unit, a bit plasticky but functions well. Paired really easily with a variety of sources. Perfectly useable line-of sight range of about 10m, deteriorates as objects are in the way - as expected. Slight hiss when no signal present, barely any decoding delay so good for watching video (lip-sync) but not fast enough for IEMs. Comes with several useful connectors. Nice balanced sound for such a low-cost unit, recommended.

5 etoiles sans hesiter! Je ne sais pas comment sont les autres combinés emmetteur/recepteurs bluetooth, mais le Trond que j'ai acheté correspond exactement a mon besoin. Petit, leger, robuste, simple a utiliser, bonne autonomié, bonne puissance "output" en recepteur,et SAV au top! Le representant d'assistance ma ecrit avant meme que j'ai réceptionné l'appareil pour me proposer des conseils pour faciliter ma prise en main...(je n'en ai pas eu besoin, car l'interface utilisateur est parfaitement claire et l'appareil est "plug and play" . Je suis musicien et je l'utilise pour faire passer des musiques enregistrés de mon ipod a la sono pendant les pauses de nos spectacles, et pendant les repetitions aussi en utilisant mon ipod SANS FIL pour controler choix de musique et volume. C'est geniale. On peu se deplacer et garder le controle a tout moment. Rapport qualité prix imbattable. Avis spontané, non-solicité. Pierre

I have several pairs of high quality Bluetooth headphones which work great with my smartphone, but wouldn't play nicely with my Windows 10 PC. I previously tried a cheap USB Bluetooth adapter, but the sound quality was rubbish - lots of lag and crackling. This Trond Bluetooth DUO device works almost perfectly with my PC. It supports AptX Low Latency for the best sound quality. It's definitely much better than the cheap USB Bluetooth adapter I was using before. Pairing with my Bluetooth headset was easy. The hardest part is remembering what button presses are required! 3 seconds on the multi-function button (MFB) turns the device on or off. To enter pairing mode, it's a quick double tap on the MFB. There's a red and blue LED - different combinations of flashing lights mean different things... you have to refer to the user manual to understand the flashes, which is a little annoying. Would it have cost much more to have several different LEDs with little icons to indicate their purpose? Even basic home Internet routers have several LEDs with icons. This Trond device stopped working once during the first month of use. I had to switch it to receive mode and then back to transmit, then re-pair with my headphones, then it started working again. One unfortunate problem is the noise generated when you have the power plugged in - you can hear low-level static interference while music plays. Not good. I would have happily paid more for a device that didn't suffer with such basic electrical interference. For the price this device is fantastic. I just wish it was a little easier to use, with separate buttons for different functions and more LEDs so I didn't have to remember what all the morse code flashes mean! And the static noise while charging is a real shame.