While this stylish and efficient set of head- and tail-lights is designed for cycling, the lights can readily be adapted to all outdoor activities including hiking, backpacking, camping, boating, and even jogging. Solar-powered headlight; solar power tail lightIntended for use as bicycle headlight and tail lightGood for use in any weather conditionGreat for emergency lightsLightweight portability3 LED bulbs on each unit--Super-bright digital IC-controlled white micro-LED bulbsNICHIA LED, 12500~15500mcdModes: Steady and flashingIncludes brackets for mounting on bicycle handlebar and seat postStorage battery: Li-ion, 610 mAh; 150 mAhRun time (in full-power condition): Headlight: 28 hrs in flashing mode; Tail light: 7 hrs. in flashing modeEco-friendly: uses renewable solar power to light, decreases pollution from mercury and other chemicals. RohS compliant and CE certified. Durable: Sturdy, water-resistant, elegant hard housing protects the headlight's innards against the bump and crush. Quick installation with hassle-free adjustmentHousing Color: GreenWeight: Headlight: 80g / 2. 8oz; Tail light: 21g / 0. 8ozBikewagon cannot guarantee that included batteries will be fully charged upon receipt.