Cheap, and terrible bluetooth connectivity lag problems
588421
I've actually been pretty disappointed by this mouse.  Yes, it's somewhat more ergonomic than a traditional mouse, but it still causes a fair amount of forearm strain.  But the worst thing about it is its bluetooth.  It lags ALL THE TIME.  Sometimes I'll get a day or two where it works fine, but most of the time I'm fiddling with it to get it to go where I want it to go on the screen. Frustrating.  I slammed it down on my desk to day in frustration, and that was the end of this cheap thing.
1536055
Latency starts ten minutes in when connecting to Amazon echo if you can get the bluetooth connected. It took a few tries to connect, don't know if this was the echo or avantree. I also bought avantree bluetooth head phones and signal skips when eight feet from tv, again don't know which one is the problem.

I have received a $15 partial refund from avantree, but still can't recommend this bluetooth product. I do highly recommend the avantree headphones though.
3887069
Bluetooth connection sucks. Only problem i have. Says paired, and then connected, then disconnected over and over. Never stays connected its a pain because that was why i bought the unit. But for price not gone lie cant beat it. Every thing else is just fine. You get what you pay for. Pic below to show Bluetooth going in and out. Tech support or customer service is not willing to help.
3898624
So far, I have to give this only 3 stars. It randomly disconnects and reconnects, even when the phone is barely 2 feet away. I'm uncertain what is going on, but it's the only bluetooth I have had this problem with. It's not aggravating enough to lower it to 2 stars, at least not as of this moment.
1938887
Wireless speakers doesn't work anymore. Bluetooth doesn't pickup anymore.
1142596
No problem getting my bluetooth keyboard to connect. After it does, it doesn't function. Then to remove something from bluetooth devices and put it back I ultimately have to restart my computer because it won't pick it up again until I do. I would not recommend this.
90839
These earbuds are great - almost. Sound quality is fine, and I had no problem finding tips that worked for my ears and provided a secure, comfortable fit. The problem is the Bluetooth connection. With my iPhone 7 in a pouch at my waist, which is my typical jogging setup, I get constant connection dropouts. It just will not work for its stated purpose under normal conditions, which is unacceptable. A huge disappointment. All those reviews that mention connection problems are right. These will be going back.
4044122
Looks nice, really good sound quality, but when using bluetooth, the sound lags and can't ever match with music or anything you're watching, so that sucks. With the cord there's no problem, works perfectly, but with bluetooth, you may want another product if you don't want to deal with lagginess.
1786871
I ordered this back in October and have used it M-F during my commute to and from work every week since I got it.  It worked great at first.

about 3 weeks ago the battery stopped holding a charge so it would only work for more than a few minutes if I kept it connected to power.  Now the bluetooth connection isn't working correctly.  My other bluetooth devices work just fine with my iPhone so I know its this device.  It connects and reconnects and the audio is choppy now or none at all.

I suppose you get what you pay for and this is pretty cheap.
960812
When I am on bluetooth mode i am getting severe headache and which basically defeated the purpose of buying wireless headphone set
4788277
The sound is good, but the bluetooth connectivity is not stable.
2479007
bluetooth has some lag though (I'm using an S8 so plenty of hardware speed). if using with an android device for gaming, assume that the tiniest delay will frustrate at times
3642441
I bought this Bluetooth to see if I liked the neckband style and I do, but I will not be buying another one like this. The connection quality is extremely poor! If I had my phone in the front pocket and leaned so my arm was above my phone I'd lose signal. I've had it for less than two months and the charging port has already stopped working.
2809124
Sound is great but connectivity stinks. The second time I went to use them, they would not connect properly. I have to go in to my bluetooth settings and remove the device then re-pair it. I have had to go through this process almost every time I have used them, which has only been about a dozen or so times. Now, today, I cant get it to pair properly at all.
2885304
The bluetooth adapter installs easily and works well. The problem is the time latency in the actual communication. Unlike land lines, cell phones generally add about 1 to 3 tenths of a second of latency (delay between when you say and they hear, and vice versa). If you are both on cell phones then double this. Well if you use the Ooma Bluetooth you can add another half a second or so to that. It was literally bad enough that I decided to just unplug the device and call it money lost for the lesson. Don't take this as an indictment of the Ooma, I'm happy with my Ooma box, but the Bluetooth is just not gonna work out...
2156521
Complete crap. Terrible interface. Took forever to get my headset to connect to it. Once it did I had no issues for a few months. Now it says connected but it really isn't. Not my headsets fault since it works perfectly fine for other bluetooth devices. New driver version came out so I thought an upgrade would fix it. New driver costs money to buy or settle for a 30 day trial. Not trustworthy. DO NOT BUY! STAY AWAY!
31463
I bought this band for my wife as a present. She already has a forerunner gps watch that she really likes, but wanted something smaller for daily use, so this seemed like a good option.  I like the features and design a lot, however the Bluetooth connectivity is  a real problem.  It connects and syncs just fine, but continuously drops and reconnects (every minute or so).  This happens even when it's right next to the phone.  So you constantly get the vibration alert saying "connection lost" and "connected". She has an iPhone 6s so I would think that this would be a compatible device.  Unfortunately, the constant vibration alerts make the device basically unusable and annoying to wear.

One thing we were thinking is that it would not be so bad if you didn't constantly get the alert.  It's not a huge deal breaker if it drops connection once in a while, just don't tell me about it every 30 seconds.  Maybe allow a setting to disable connection lost alerts?

We are returning the device and will try another model/brand.  Pretty disappointing.