5 In 1 Smart Bike Tail LightIt is worth mentioning that this bicycle turn signal has five functions: electric horn, anti-theft vibration alarm, warning light, turn signals, auto brake light (build in G sensor) . It can remind pedestrians and vehicles around in all directions, effectively protecting the safety of cars and riders. It will makes 110db loud horn sound when press remote, 3 horn sounds for your choice. Turn signal and brake lightEasily press the R/L button of the remote control clipped on the handlebar before turning, the R/L turn signal flashes with a click. Other drivers and pedestrians will see and hear from a distance, and know exactly which direction you will take. Once you brake, the tail light will automatically highlight for 2 seconds to remind other drivers behind you. Effectively avoid rear-end collisions and traffic accidents. Bicycle Anti-Theft AlarmThe tail light bike will make a loud sound and vibration. The loudness of 110DB can effectively scare away thieves and protect your bicycle. In the armed alarm state, if you touch or knock the bicycle, the host will issue a 2 second warning; If you touch or knock again within 2-12 seconds, the host will issue a 30-second continuous alarm to stop the thief. 7 levels of adjustable sensitivity, from light touch to push or knock. Ultra-Bright LED Bicycle Tail LightOur rear bike light is equipped with 31 super bright LED lights, a powerful flash up to 160 lumens to remind cyclists at night and during the day, improving your visibility and safety. Including slow flashing/breathing/fast flashing/constant light/emergency double flashing/tail light off mode, 6 light modes for you to choose. IP64 Waterproof level make this bike turning light can be used in small to moderate rain in the temperature of in -40 ~ +60. Intelligent Auto On/Off The bicycle alarm taillight has an intelligent automatic "slow flash" or "breathing" mode. The taillight turns off automatically after 30 seconds of inactivity in a dark environment, and turns on when motion is detected. In a bright environment, it will automatically turn off to save power. The rear bike light comes with USB-C charging cable. After 7 hours of full charge, the bike tail light can work for 70 hours.