Features: This bike taillight features a build in brake sensing, automatically lighting when the cyclists applies the brakes to alerts vehicles behind. With high brightness LED light and IPX6 water proof designs, this taillight is visible in low light conditions and suitable for various weather conditions. Perfect for city commutes, mountain biking, or casual biking, this brake sensing tail light increases the cyclists visibilities and safety when biking. Upgraded your bike with this innovative taillight, features multiple lighting modes, rechargeable battery for convenient charging. Suitable for cyclists, including road bikes, mountain bikes, and electric bicycles, providing a safe night cycling experience. Specifications: Materials: ABS+PC Color: As The Picture Shows Styles Optional: 3 Styles is Available as Shown in the Picture. Size: approx.3.2x3.4cm/1.26x1.33in (More Size Detail, Please See Picture.) Package Includes: 1Pc Bike Taillight (with Mounting Accessories) note: Please allow 1-2cm error due to manual measurement. Please make surer you not mind before your bid. Due to the differences between different monitors, the picture may not reflect the actual color to the item. Thanks!