VERSATILE LIGHT MODES: The tail light has five light modes, slow flash, fast flash, breathing flash, flowing flash, long bright. Click to switch the light, double click to switch the mode.INTELLIGENT SENSING: Intelligent mode mainly reflects that the tail light automatically senses the brake, and the long light is on for two seconds. During the day, tail light will automatically turn off the light after the bike has been stationary for two minutes, and light up again after feeling the vibration. At night, or when the light is low, tail light will automatically light up.LONG ENDURANCE: The rechargeable battery capacity of 500mAh, long light mode can be used for 9.5h, slow flash mode can be used for 30h. Charging cable is included in the package, just link the USB power supply to charge the tail light.STRONG WATERPROOF PERFORMANCE: The tail light adopts IPX6 waterproof process, high level of waterproof, comfortably deal with rainy weather.TWO MOUNT WAYS: Two mounting accessories are provided in the package, you can install either mount it on the seat tube with the seat tube bracket and strap, or mount it on the seat bow with the seat bow bracket. Simple to install and easy to use.