ZK-502M Audio Mini 2.0 Stereo 50W+50W bluetooth Digital Amplifier Module 50W*2 AMP Amplificador Home Theater AUX USB

No instructions but didn't take long to work it all out. The heatsink doesn't stick very well. Powering it with a 24v 5a LED brick (photo attached, cabling is short as it was just a test). Neighbours probably not impressed after I gave it a good slog with some drum n bass... But hey, that's life!Noticeably louder than my other supposed 100w amp but also noticeably not as smooth sound-wise. A bit too much midrange but if you got an EQ you'll be tweaking it. My Akai speakers aren't exactly Bose.There's some stupid voice when you switch it on. The blue light on mine constantly flashes (I was running it through the audio socket to my smartphone, rather than the bluetooth) and I would recommend you turn the volume to minimum when you power it on or off. I had a rather loud click through the speakers.For this price, it's hard to complain about the negatives. I'm going to give it full marks despite all the quirks listed above. Dollatek, take note: Get rid of that stupid voice on startup and the flashing blue light and you've got a cheap and very cheerful amplifier.

Takes 5 mins to assemble, even has a screwdriver with it, connects via BT instantly, no distortion or humming , could fit literally anywhere. Build quality is good.

I’ve used quite a few different Bluetooth amp boards for projects. I like this one as it had a proper volume control and on/off switch. Easy to attach it to the inside of the box, just left off the top board. Easy to pair and connects every time. Sounds amazing for £12, cannot complain at all at that price. Would definitely buy another

Very easy to put together, and feels more robust as a pair of printed circuit boards connected with brass standoffs than an equally-cheap plastic housing would.The negative reviews seem to suggest it can burn itself out, but adding active cooling is extremely easy - it keeps its USB port powered when it's in the other modes, and there's enough current coming from it that its 5V output is keeping a 120mm PC fan meant to run on 12V spinning quickly enough to move air, but slowly enough to be silent. If you don't want to run a bodge, one of those pound-shop gooseneck USB fans for laptops would probably be just as good, and 50mm fans with USB cables are cheap too as people use them to cool 3D printer hot ends.When I was putting it together, I made sure to fit the little heatsink so that the fins are perpendicular to the edge it's closest to - I don't know how much of an actual effect that'll have, but it means the air can move through the fins rather than into the side of one.It seems to be fine with some pretty big speakers - I had a pair of Alesis M1 Mk. II active monitors die, victims of the capacitor plague, and I converted them to passives: each are now 8-ohm with 5.5-inch 75W woofers and 25W tweeters, and this thing, powered by a 20V 3.95A laptop PSU rescued from the dump, is able to run the pair of them fine. More than loud enough for a medium-sized room with no missing low-end. The photos make it look like it'll be too small for this to be possible...and it's even smaller in person. Brow-furrowing.If I haven't updated the review, assume it's still alive!

This little gadget is awesome. For £10 you have a Bluetooth receiver, usb port and 3.5mm jack port, with volume control.Use any 12-24v DC adaptor plug and spare speakers (I used an old set of 6x9 car speakers) and you can creat a very useful speaker package for parties or garden use.I purchased some MDF, and set the speakers into it, then wired the lot together and have a great system for the garage. Pair it with your phone or plug in a usb for loud music at discount price.

I bought this about 5 months ago it worked brilliantly, then it suddenly just stopped in fact it blew 2 fuses.To top off my upset I also sent an enquiry to the company of which I'm guessing they are refusing to answer me because it's over 30 days. I waited 5 days for an answer and now I'm writing this review.Do not buy this product it only lasts a few months, but while it lasts it's bloody brilliant! Thank goodness it's cheap.

Surprised how good this little gadget is. Works very well and quick and easy to assemble. Just what I was after to enable me to effectively plug my old hifi speakers into my Macbook.

it cant really run on 5 volt very well without cutting out, maybe 5volt 2 amp but not really off a power bank but 9 volt or more works fine and its bluetooth works really well, soundwise its really not bad