Feature: - Waterproof: IPX4 - USB rechargeable light, built in rechargeable lithium battery for each light. No battery replacement. - The Headlight and Taillight feature 4 modes: full brightness, half brightness, fast flashing and slow flashing, switches it as you need - Advanced silicone mounting strap. The strap is elastic enough to fit all kinds of bikes and can be mounted on any part of the bike - Easy installation. The strap can be easily loosen and fasten, and no tools are required. - Get riding safely. Guide the way with the headlight and need not worry about being knocked over by others with the taillight. Patameter: - Color: Red, white. - Material: Aluminium alloy, Plastic. - Size: About 4.5 * 4.5 cm/ 1.77 * 1.77 inch(L*W). - Features: 4 Light Mode Options: Full brightness, Half brightness, Slow flashing, Fast flashing. - Discharge Time of Full charge. - Head Light: 3.5hr (full brightness) ,10hrs (half brightness), 10.5hrs (slow flashing), 10hrs (fast flashing). - Tail Light: 2.5hr (full brightness) ,9hrs (half brightness), 9.5hrs (slow flashing), 9hrs (fast flashing). - Battery:rechargeable lithium battery. Package Content(Optional) package 1(1pcs-red) package 2(1pcs-white) package 3(2pcs-Red and White)