... vibration speaker with Rechargeable built-in lithuim battery OEM&ODM oders accepted CE&FCC&ROHS ... unimpededRemote controlCan read TF cardBuilt-in rechargeable Li-ion Battery.Audio Source: PC,MP3,MP4,MID,CD,DVD ... ,Mobile phone,iPhone,iPod etc.When you use Taking ,please put it on hard surface upward ... DC Voltage: DC 5V±0.5V Inlayed Lithium battery:600mAh Maximum output power:5W Frequency Range:80Hz- ...