Features1The design of the smart sensor chip has high safety and can protect you, when you are travelling. 2The brake sensor of this brake light is very sensitive and has a fast response speed, which can fit your needs well. 3With highbrightness LED lamp beads, Fresnel lens lampshade, professional processing and better performance. 4The lens designed by Fresnel principle has high brightness, softness and non-glaring, which can protect your eyes. 5Lightweight, compact, easy to carry, efficient and waterproof, no fear of wind and rain, no need to be afraid of light rain when going out.SpecificationItem Type: BicycleTailLightMaterial: PC+ABSBrightness: 100LMBuilt-in Battery: Polymer Lithium Battery, Capacity 500MAHQuantity of Battery: 1PC (Built-in Battery Shipped)Power Description: 2 Hours and 20 Minutes Full of Power, Constant Light Battery Life 10.5 Hours, Long Battery Life 33.5 Hours, Standby Time up to One Year.Features: Waterproof, Smart Light Sensor, Vibration Sensor, USB Direct Charging, Etc.Package List1 x Manual1 x BicycleTailLight1 x The Silicone Belt1 x USB1 x Film