Easy to install on your bike's handle. Provides additional lighting for other vehicles to see you on the road. Lighting pattern: lighting and blinking. This product is not waterproof. The batteries used are 3 AAA batteries (NOT INCLUDED) Material: ABS resin Polystyrene Vinyl chloride resin Silicon rubber Steel LED Product size: 6.5 cm x 11 cm x 7.3 cm Contents: 1 piece