... on,portable,pocket speaker: 1.Built in rechargeable 500mAH 2.Singal noise ratio:60dB 3.Play time:4 H Founctions: Mini speaker ... a 3.5mm audio output jack.4.Connected with PC by USB data cable,it has download function5.Built in rechargeable 500mAH,3 ... .7V lithium battery Specifications: 1.Maximum operating current:200mA2.USB charging ...