*High Quality*Made of high-quality materials, durable and practical*Smart Brake Tail Light Bicycle Rear Light Automatic Start/Stop Brake Sensor Mountain Bike Road Bike Tail Light USB Rechargeable Waterproof Cycling Tail Light *Brake Sensor/Light Sensor/7 light modes/highly efficient waterproof/USB charging, etc.* Press the brake sensor and light sensor for automatic mode/Press for 3 seconds to turn on the machine for manual mode* The ambient light sensor will automatically sense when you step on the brakes. Switch to highlight mode to remind the rear. *Seven modes, switch between fast flash/low power slow flash/high power slow flash/breathing flash/low light/medium light/high light*Using USB charging and 500mAh battery life to meet daily life. *ABS plastic shell, the material is light and thin, which really increases the burden of riding*IPX6 highly efficient waterproof, no need to worry about wind and rain when traveling in rainy days*Double bracket design with two installation methods, suitable for different bicycle models and riding scenes Specifications:*Type saddle bracket seat post bracket*Lamp beads: high brightness LED lamp beads*Battery: 500mAh*Mode: 7 light modes*Color ：Black*Case material: PC +ABS*Weight: about 24g (excluding bracket)*Size: diameter 37mm, length 42mm >*Waterproof grade: IPX-6 *Product dimensions:Diameter 37mm, length 42mm;Base: height 9mm, length 53mm;Long stand: length 118mm. Package list:1 x bicycle tail light1 x base1 x long bracket1 x USB cable