Instruct: Classify Amazon reviews into positive or negative sentiment
Query: great sound and battery life

I have not had the best bluetooth experiences and I was about to give it up and wait, but I'm really glad I gave this a try. It has great sound quality, both for me and whomever I am speaking to. It's easy to get on and reasonably comfortable, so that I sometimes end up wearing it and forgetting that it's there.It also easily converts from one side to the other, which has been a big help to meThe downsides for me are that A: the ear pieces don't really fit. The small is too small and the medium is much too big, so I put up with some looseness, but that also reduces the pressure in my ears.And B: that awful power button. REALLY, there is no excuse for something that bad these days, it has taken me quite a bit of struggle to find a way to live with that, and that is really not excusable these days and at that price.Over all, though ,I am really pleased to at last find a bluetooth headset that fits well enough and functions just as it should