With a intelligent sensor, The bike tail light will turn on automatically riding in low brightness and turn off in high brightness within 30 seconds. Automatically switch to brake light mode when decelerating, lights highlight 3 seconds to warning rear car to improve safety.
IPX5 waterproof level, it can prevent splashing water from any angle and withstand all adverse weather conditions.
It only takes 2.5 hours to fully charge with included USB cable.