M-Wave Helios USB battery rear light Are you an adventurous cyclist and do you also like to cycle in the dark? Then you are in the right place with this rear light. The rear light has LED lighting, a battery level indicator, charge controller, a clip-on bracket, a bracket for seat post or frame tubes, integrated Z-reflector, an on/off button and it is USB rechargeable. The charging time is 2-3 hours. Specifications: Color: black, red Gender: unisex Material: plastic Mounting bolt distance: adjustable from 50 mm to 80 mm Voltage: 3.7V / 300 mAh Rechargeable: yes, USB