USB RechargeableBuilt-in 600 mAh battery, stable voltage and safe. USB cable charging, suitable for multiple interfaces, fast and practical. The working time is about 4 hours of charging, can use about 6 hours.5 Lighting ModesThe bike tail light has 5 lighting modes: strong light - low light - red and blue flash -COB strong light -COB weak light, you can be adjusted according to the use environment.IP55 WaterproofThe bike tail light is an IP55 waterproof and dustproof rating. Life-level waterproof, regular use in bad weather, no need to worry in rainy or unexpected. The body is small and light, easy to carry.Safe to UseAdopt a diversified USB charging system, unified interface, and multiple charging modes, convenient, safe, and practical.Multi-functionThe light with an iron box is convenient to store when not in use. The clip can clamp on the shoulder or waist. It also can use for bicycles, mountain bikes, folding bikes, road bikes, helmets, etc.