Durable Dynamo Led Flashlight Energy Saving Built In 500mah Battery

Durable Dynamo Led Flashlight Energy Saving Built In 500mah Battery Description: Built-in battery: LIR2450 3.7V 500mAh. Using time:About 8 hours for lighting, 3 hours for radio, 2 hours for blink. Charging time:About 3 hours by cranking, about 5 hours by USB 3M cranking gives lighting(15M)/radio(5-10M). Frequency:FM88-108MHz / AM540-1600KHZ Rated output power:500mW. LED brightness:12000mcd. Output voltage:DC5.1V. Output current:less than 500mA. Power generated by crank dynamo