Rotary charger for emergency use. When without power source or under some emergency conditions. It will show its great function.1.Only rotary the handle, you could charge your mobile phone.2.Get 2~8 minutes communication with this product.3.Do not worry about power sudden shut-off.4.It contains a LED, acting as a emergency light.5.Subminiature size, convenient to take.6.It is of safe design.