1. Enhanced Safety Features: The MEROCA Smart Bicycle Tail Light features advanced auto start/stop technology and a sensitive brake detection system to enhance visibility and safety during rides. 2. Waterproof and Durable: With an IPX6 rating, this tail light is fully waterproof and built to withstand all weather conditions. Its durable construction ensures reliable, long-term performance. 3. Convenient USB Charging: The built-in rechargeable battery can be easily charged via USB, providing extended runtime ideal for long rides and daily commuting. 4. Universal Fit: Designed for compatibility with most bicycles, the tail light installs quickly and securely, allowing for fast setup and removal. 5. Light Display: Press the power button to turn on the light. Subsequent presses cycle through 7 modes: 3 flash patterns, 3 brightness levels for steady-on, and 1 breathing mode. Light Source: COB LED Maximum Brightness: 100 lumens Beam Angle: 180 degrees Battery Capacity: 500mAh Lighting Modes: Steady / High / Fast Flash / Flash Color: As Shown Dimensions: 11 x 8 x 3.5 cm Material: AL6061 Style Options: A Cushion Color / B Seat Tube Black / C Cushion Gold Pink / D Seat Cushion Black Package Contents: 1 x Bike Light, 1 x Bracket, 1 x Data Cable Note: Light reflection and display settings may cause slight color variations between the image and the actual product. Measurement may vary by +/- 1-3 cm.