Features: This bicycles tail light 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. Upgraded your bicycles with this innovative brake sensing taillight, features multiple lighting modes, rechargeable battery for convenient charging. Perfect for city commutes, mountain biking, and casual biking, this bike brake sensing tail light increases the cyclists visibilities and safety when biking. Suitable for cyclists, including road bikes, mountain bikes, and also electric bicycles, providing a safe night cycling experience. Specifications: Materials: Plastic Color: As The Picture Shows Package Weight: approx.151g Size: approx.5.7x3.5x2.50cm/2.24x1.37x0.98in (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!