... 4)FM high fidelity radio on option5)Standard Li-ion battery with protection circuit inside. 6)Turn off the player timely, you ... , 1GB, 2GB,4GB,8G,16G,32G (Optional)BatteryLi-polymer rechargeable battery,5 - 7 hoursPower voltage: 3.7V/400mAh Li-ion ... factory customize service:Logo service:Laser logo, Silk print logo, Full colour logoLaser logo:Works with metal surfaces onlySilk print logo ...