... mechanismdrives a built-in AC, then through rectifier voltage convert to DC. It has FM radio, alarm, flashlight and ... and radio, three basic functions in one.Features:Cranking to generate power, no external batteries needed, rechargeable power-storage ... time after 1 minute cranking20 MinutesNote: Lighting discharge standard to luminous flux: 100mLmExternal power input charge Voltage output5.2V ...