I waited to review this product to see if time would show it is no good, and it did not show me that.  This is the best blue tooth device i have ever seen or used and have already convinced 3 other people to switch.  The battery lasts for I would guess about 8 hrs of talk time and 2-3 weeks without a charge with me only using it a little each day.  The sound is better than using my phone and people can hear me without any static. The only improvement that I can think of is to put a battery meeter to let you know how much power is left instead of it just dying on you.  I just try to charge it every 1-2 weeks now before it dies and it is great.