Sounds fantastic, just tune the right frequency.
Range is really good aswell, reaches through the walls in whole house and around.
Battery life, did not find out, because never used it longer than 4 hours.
I love the option of switching it off, if not used, so battery won't run flat + volume control which goes beyond the loud I use.
The only thing I was surprised at start was nonexistent head size adjustment. I believe one size fits no one. However, there is that elastic strap which is supposed to adjust itself when you put it on head. I got used to it after few hours, even though I have big head and ears, so someone with normal size of head will probably fit perfectly.
Oh yes, and price/quality is definitely outstanding (in good way) comparing with other wireless headphones on market.
Would recommend it to anybody.