Don't need to change battery, so don't worry about contamination so soil or water unlike using dry battery. It is helpful for sustainable cleanliness of environment.

A small motor is provided, and power can be generated by swinging the handle clockwise, meanwhile, an energy saving and high light LED is used.

Emergency recharging for mobile in the circumstance of accident or emergency, just press the alarming button, and alarming sound about 65dbs can be given out.