The flashlight never need a battery. It is charged by shaking the unit. Never let you down. At home, in the car, in your camper or boat or storm emergency kit, it is always ready, even if you haven't used or checked it for years. 1minute of shaking will give up to about 5 minutes of continuous bright light. Features: 1) Rechargeable capacitor. 2) Opearted by: Dynamo. 3) LED-light: Luminescence intensity is about 15, 000 mcd. 4) Water Resistant. 5) Floats on Water. 6) Environment protection. 7) Product size: 17cm length. 8) Great for cars, boats and campers and all emergency kits for your outdoor Activities. 9) Weight: 100g. Inner packing: Color box Outer packing: 100pcs/ctn Carton dimensions: 48 x 37 x 25cm N. W.: 13. 0kg G. W.: 14. 0kg