Safe Night Riding Design: This bicycle light is very suitable for night riding. It is easy to install, the light is bright, which is easy to attract people's attention. 4 Light Mode: The Headlight and Taillight feature an one-touch switch with four different lighting modes, including full brightness, half brightness, fast flashing and slow flashing. Suitable for All Occasions: The mountain bike light has 4 lighting modes, no matter what the occasion, it can illuminate your way forward, and it is waterproof even in rainy days. USB rechargeable light: Built in 650mAh rechargeable lithium battery for each light. Life time: about 2-3 hours. Easy Installation: The silicone mount straps are designed with two openings, so it can tightly fit around many size seat posts, handlebars, seat risers, backpacks, helmets and keep lights secure and firm.