1. Enhanced Safety Features:The Smart Bicycle Tail Light is equipped with advanced auto start/stop technology and a sensitive brake detection system that increases your visibility and safety while riding. 2. Waterproof and :Certified with an IPX6 rating, this tail light is fully waterproof, making it suitable for all weather conditions. Its robust construction ensures long-lasting performance. 3. Convenient USB Charging: Easily rechargeable via USB, this LED taillight offers extended runtime, making it perfect for long rides and commuting. 4. Universal Fit:Designed to fit a wide range of bicycles, the installation is quick and easy, allowing you to get back on the road in no time. 5. Light display: the power button once to turn on the taillight. the power button again to switch the light. There are 3 flashing modes, 3 brightness levels for long-on, and 1 breathing light, for a total of 7 light modes. Lamp beads: COB LED Maximum brightness: 100 lumens Flood angle: 180 degrees Battery: 500mAh Lighting mode: constant light/high light/fast flash/flash Colour: As Shown size:11x8x3.5cm Material:AL6061 style: B Seat Tube Black Package Contents: 1 * Bike Light 1 * Bracket 1 * Data cable Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.