No fear tough bluetooth speaker waterproof ipx6 can mount on a bicycle superior sound bluetooth 41 size 96588495cm transmission distance 10 m output power 3w support handsfree function speaker unit diameter 50mm inner magnetic 4 ohm 5w battery built in lithium battery 37v1500ma charging voltage 5v 025v charging time 3 4hours working time 5 8hours accessories micro usb chargeable cable dual 35mm audio cable black