the LED shaking flashlight is the newest flashlight and have more advantage than other kinds of flashlight: 1、Environmental protection。Translating kinetic energy to electricity energy , not only save energy sources , but also never needed batteries. 2、Super bright LED and indefectible , wildly apply in automobile , houseboat , bivouac , emergency etc. 3、Waterproof ,the flashlight even can float in water. 4、15-30 Seconds of Shaking provides up to 5 minutes of continuous bright light.