I have had it for about a month. I am not an "all day user", I have only charged it like 3 times. I wander around about 50% of my (1800 sq ft)house away from the phone & it works. Sound is fine until you start to go out of range, and then you can tell when it is going. I have used it in my MR2 with the windows down & the t-tops off and the caller heard me just fine, I was not at highway speed, but up to about 45mph in around town traffic. Great headset.