High brightness LED bicycle taillights: Choose different lighting modes to protect your bicycle safety. The daytime driving recorder is super bright, making it easier for other road users to see you. The intelligent bicycle brake lights automatically turn on when slowing down or stopping. Anti theft bicycle alarm with remote control: When any movement or vibration is detected, the high decibel sensitive horn will emit a loud sound, effectively preventing bicycles from being stolen. Automatic turning on/off of LED rear cycling lights: In flashing or daytime flashing mode, the cornering lights are triggered by movement. The bicycle taillights automatically turn on when any movement is detected. When the bicycle is stationary for more than 30 seconds, the bicycle lights turn off. Intelligent light sensing saves time: Equipped with an intelligent light sensor, the bicycle taillights automatically turn on at low brightness and turn off at high intensity, thereby saving you time switching between bicycle taillights. Easy to use and waterproof: The saddle and pillar installation make the taillights suitable for different bicycles. The excellent IPX5 waterproof bicycle taillights can be used in rainy days. The safe USB rechargeable polymer lithium battery provides a lightweight battery life of up to 40 hours.