coolbit Smart Band, Activity Health Tracker Smart Bracelet w/Heart Rate Blood Pressure Oxygen Monitor Fitness Tracker Pedometer Calories Track Notification Remind Wristband for Android and iOS Phones

I was looking at smart watches for my new Android phone but $2-300 prices and future compatibility issues made me start looking at less expensive fitness bands with notifications (I didn't really care about cellular or music capabilities, but did want some form of GPS, even if it relied on the phone)   This was the cheapest/highest rated fitness tracker band 'Fulfilled by Amazon' with blood pressure/oxygen levels (SpO2) which I felt were good add-ons, if they worked.  I got it in 2 days, enough time to research a few things before I received it, and find a few more after using it this week: - Seems this latest 'M2S' model (and its cousins for sale on Amazon and Asian trading sites) may be some kind of Huawei Band 2 knock-off with added O2 and blood pressure measurement; articles online show these features either in development and/or abandoned by Apple, Fitbit and Huawei itself, I'm guessing for legal liability reasons (there is a version of this without the BP/O2 that adds 'relaxation times' - it is basically the Huawei Band 2 Pro)- While shopping BP+O2 models look carefully at body/band shape, release date (7/2017 and later) and display sceenshots - only this version is so highly rated, and there is an older, bigger 'M2S' without O2.- Searched in various product descriptions (and Play Store) for names of, and then downloaded and looked at 3-4 different apps that I hoped may have been compatible, before I got the band.  It seemed complaints of typos, poor usability and lack of features in the apps for these things was their main issue, and could really impact the user experience.  I found a couple of apps that don't support the BP/O2 tracking, but may work; I didn't keep any of those (especially 'Huawei Health' as it had the nicest interface, and I hoped may have added BP/O2 once the band paired with it - no go, this band was not even recognized)- The app named for use in this listing's description is 'WearFit2.0', author/developer 'Wakeup'; it seemed ok but was trying to be too precious with its graphics, and had typos all over the place. There is one on Play called '4Fit Band' author/developer 'Four Connect' - this app has a cleaner (but very similar) interface and much better English translation...plus, looking at 'About' in software info, developer was actually listed as 'Wakeup', same as the recommended app.  4Fit had an added button (not in WearFit2.0) for a band firmware upgrade, but I have no idea what kind of support this option will receive; 4Fit is the app I ended up pairing with (both apps link with Google Fit)- I work nights and so was disappointed that the 4Fit app stated under 'Sleep Tracking' that sleep is only recorded from 2100-0900, with no option to change it; as I continue using it this week I'm hoping it may adapt.  WearFit2.0 doesn't indicate a set sleep tracking period, but may indeed only track at night as well.- I have checked the blood pressure and SpO2 against professional instruments and they're consistently accurate, certainly better than you might expect from a device for this price - I can see though, with some readings, why the big corporate entities didn't want to put their name on the technology.  Overall, very pleased for the price.- I haven't checked the fitness tracking really at all, I may update the review but so far it seems to be about in line with the accuracy of my old Fitbit Flex, with the added bonus of being able to dial in my exercise type.- I'm having trouble getting SMS messages to scroll past the first couple of words, but their (and incoming call) notifications are instant, which at least gets you to dig out your phone, and the 'find phone' and 'find bracelet' functions work very well.- Remote camera shutter function seems to open photos in the tracker app, and I can't figure out yet how to get them into the Gallery; this and some other behaviors of the app make me wonder (like some other people) what these apps are doing in the background, but frankly with all the info breaches lately, I've kind of given up caring anymore!- Standard size USB charging port is accessed by pulling the upper band away from the main body (a little stiff/hard to remove on the first go) - feature isn't pictured very well on any of the literature.Ultimately, since I get a new phone about every 1-1.5 years I'd rather get a new one of these (with whatever new features) every few phone cycles then waste my money on a smartwatch..fun device

I like the device. I wish it didn't have so many sub sections that are to easy to activate. The manual was in microprint that you had to blow up on a copier to read. Also, the app it suggests to use freezes frequently. I do like the oxygen, step counter and blood pressure measure. The sleep tracker is nice and has helped me adjust my days when my sleep was not as good as I thought it was.

Compared to some other fitness bands I've purchased and returned in the recent past this one is the one I'll keep. The positives are-Large numbers for older eyes.Option to change the clock face to a dial.There are some detractors. They are-The band loses connection with my iPhone 7. The app claims the band is "bound" and the bluetooth symbol on the tracker faces is seen and the bluetooth setting on the phone shows the band connected yet when you look at the steps and heart rate it says "not connected". This seems to happen overnight or when the band and phone are separated. The fix, at least for me, is to turn the bluetooth off at the phone and turn it on again. The app says the band is "connected" once more.Update: 12/8Turning the BT off and on at the phone re-connects the band everytime. No need to "rebind" it.The initial charge has lasted nearly a full weak. When you plug it into a USB charger, if the band is on the battery charging icon will not show up until the band is turned off. Turn off the band, plug it into the charger the battery with the cascading marks shows up signfiying charging.The alarm I've set is reliable and effective to wake up by.Sleep monitoring appears to be accurate at least when it says poor sleep I feel sluggish the next day. BP is still lower when compared to devices in the CVS or Walgreens.The device just might earn its fourth star in a few weeks.The BPM reading stays low as does the blood pressure. It's not supposed to be a substitute for a more exact medical measurement just a barometer of how good or bad you are.So far the broken connection is an annoyance. For the first week the charge has held for at least three days with 50% battery capacity still available.

Bought this to primarily use to track my pulse and oxygen saturation because it would've been more convenient than the conventional ones that go on your finger. But the accuracy is abysmal. I bought a new pulse oximeter at the same time to compare it to. The pulse oximeter showed differing stats depending on my movement and activity. The "Smart" Band pretty much stayed in the same range the entire time. While the pulse oximeter showed my pulse rising to 127 (as it should), the Smart Band stayed at 80 and didn't budge by more than a digit or two. Same problem with the Oximeter.Great in theory but in reality this is just a gimmick in my opinion. I have no comment on the rest of the features but doubt they aim for high accuracy either.

Update: After several months of use I noticed that the heart rate, blood pressure, oxygen don't really work well. I've measured BP with a real doctor's instrument and so the HR and it doesn't even come close. PLEASE DO NOT TRUST ITS READINGS____Although it took WEEKS to arrive I'm very impressed w/ the product. The battery life is excellent. The first charge kept it running for 9 days of moderate to intense use.All the functions work great although the app needs some serious language review. I figured you need to press it against your wrist to get more accurate readings.