product specification： - Bluetooth Version：BT 4.2 - distance receive：~30 meter - speaker size：2”x2 - battery capacity：3.7V/4000mAh - output power：24W(Peak) - charge：5V/1A - Removable silicone handle for easy carrying - charge time：~3.5 H - Playing time：100%~10H，50% ~12H - product weight：~0.733kg - product size： 165×85×85mm - Function: /TF/AUX IN/USB - Disk/KARAOKE/FM/REC