Features Built-in rechargeable lithium ion battery; Charged via usb; High fidelity speaker for clear pure sounds; Loud volume & the mini speaker Closes for easy mobility. Specification Power output: 2 w speaker: dia (36mm) Dimensions: d(52mm) x h (35--64mm) Snr>=89db Runtime: 6 hours (medium volume) , 4 hours (loud volume) Net weight: 50g Lithium ion battery volt:3.7v Lithium ion battery input: 5v Charge voltage: 4.2v Battery capacity: 300mah Operating temperature: 0 c-40 c Charge time: 2.5 hours (dc 5v) , 4 hours (usb) Battery lifecycles: 300-500 times Packing content 80 sets/ ctn; 40 sets/ inner box, two inner box in a ctn N. W. : 10 kgs G. W. : 11 kgs Carton size: 51*33*48cm Place of origin: guangdong in china Minimum order: piece/pieces 1000 Supply ability: piece/pieces|100000|month Package: packing: gift box 80 sets/ ctn;40 sets/ inner box, two inner box in a ctn n. W. : 10 kgs g. W. : 11 k Delivery time: 20 days