Features:Model: WF-501BWork Voltage:3.6V~4.2VType of LED Bulb: CREE Green LEDSwitch: End cap press on-off switchLED lifetime : 10, 000 hoursHigh temperature processed toughened clear anti-reflective coating glass lensSpecial reflector design, enhance light output in intension and distance.Specification:Bulb: 5W CREE Green LEDMaterial: 6061T AluminumLumens:280LumensPowered by 1x 18650 (not included). a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a