The GV-BT100 headphones have a built-in rechargeable battery which
delivers up to 8-10 hours of music playback and 6 hours talktime.
Quality designed headphones with a built-in microphone for handfree
operation. With control buttons conveniently placed on each earpiece
allowing full control of your tunes, while also letting you answer any
incoming call. Comfortable and lightweight with an adjustable headband
and soft ear cushions - great for long periods of use.