AUTOMATIC BRAKE DETECTION & IMPROVED SAFETY - The Smart Bike Tail Light features a smart brake sensor and built-in accelerometer that detects deceleration and signals to vehicles and other cyclists that you are slowing down. This feature is available in Flashing or Pulsing Mode and automatically switches the tail light to Steady On mode within 3 seconds of detecting braking. 4 LIGHT OPTIONS & POWER-SAVE MODE - The bike tail light offers four lighting modes: Flashing, Breathing (Gradual Pulse), Strobe, and Steady On. Each mode uses smart technology to detect ambient light conditions and adjusts brightness accordingly. After 30 seconds of inactivity during daylight, each mode transitions into power-save mode. Strobe and Steady On modes also feature power-save functionality during nighttime inactivity. RECHARGEABLE & WATERPROOF - The Smart Tail Light is USB rechargeable and can be easily removed from the mount for convenient charging. It is IP65 rated for water resistance, making it suitable for various weather conditions. Ensure the rubber USB port cover is securely closed to prevent water ingress. EASY INSTALLATION & VERSATILE USE - Installation is simple: attach the light to your bike’s saddle bracket or seat rail using the included durable cable ties or bands. No tools are required. In addition to bicycles, this light can be mounted on strollers, wheelchairs, pet harnesses, children's bikes, backpacks, and helmets for increased visibility and safety.