YYGIFT Waterproof 20 LED Bicycle Wheel Light String Safety Cool Bike Wheel Light for Night Safe Cycling - Working with 3AA Batteries 20 LED on the light string with 2 flashing modes. Waterproof,durable,high brightness,and flexible .Can be installed on anywhere of the bike. Ultra-bright micro LED string lights make your cycling safe and great cool at night . Battery Required :3AA Batteries( Not Included ) Package Include :1 * LED wheel light string ,1 * Non-slip mat ,4 * Binding wire