Support MP3,WMA format USB interface: USB 2.0 Built-in Rechargeable Li-ion battery,small volume of high capacity Can be charge via USB port or AC adapter Recharge time: about 2 hours. The Sunglasses MP3 Player will be turn off when suspended after the state for more than 30 seconds or end MP3 broadcast. Capacity of Memory : Maximun to 4GB Weight : 50 g
