Tip, to charge cell phone with the self cranking device, you need to keep cranking it to provide enough energy. For smart phones, you need to start cranking really fast until the screen shows normal charging, and then slow down to normal cranking speed. Built-in battery: Ni-Cd 300mAh 3.6V. Solar panel: 2350mm 5.5V 40mA. Charging time: 36M(by cranking)/8H(strong sunlight). Using time: lighting(10H)/radio(4H)/siren(1.5H). 1M cranking gives lighting(15M)/radio(4M)/siren(120S). Frequency:FM88-108MHz / AM540-1600KHZ. LED brightness:12000mcd. Output voltage:DC5.1V. Output current:350mA Voltage: DC 3.6V. Rated output power:500mW. Input voltage:DC6V 0.2V. Input current:300mA. Raw Material: ABS+PS.