it is a self-generating product, which is charged by cranking the handle, the power is generated by a dynamo/motor inside Function: 1) No need for batteries or external power source 2) Charging method: by cranking the flashlight handle 3)150 rpm/1min wind-up provides 90mins of power for 1 LED, 45mins with three LED or about 8mins mobile phone talking time 4) Kits includes popular plug for different mobile phone (Nokia, Sumsung, Motorola,LG...) 5) Output Voltage: 5.5-6V, Direct current: 500-600mAH, Power: about 3WDescription: