Smart Bicycle Taillights With Alarms: Not only bicycle taillights, but also antitheft bicycle alarms. Built in motion sensors and vibration alarms, this bicycle taillight can help effectively stop thieves with a loud 110dB alarm, providing additional security that gives you peace of mind when your bike is parked outdoors. Level 7 adjustable vibration sensitivity, from gentle touch to push or tap, you can easily adjust the sensitivity as needed. Smart Bicycle Brake Light: Bicycle brake light with built in G sensor. Once the brake is applied, the taillight will automatically turn on for 2 seconds, reminding the other drivers behind to effectively avoid rear end collisions and traffic accidents. 4 Modes Light: 160lm ultra bright and 270 degree ultra wide bike taillights Powerful flash alerts drivers at night and during the day to improve your visibility and safety. Slow flash, breath, flash, always on and turn off, and easily choose from 4 light modes via wireless remote control. Intelligent Automatic Switch: Don't worry, when you sleep at night, the bicycle taillights will automatically turn on. Built in light sensor and motion sensor. In slow flash and breathing modes, the taillights automatically turn off after 30 seconds of sitting idle in a dark environment and turn on when motion is detected. In bright environments it automatically turns off to save power, and if you need a taillight during the day, you can choose to flash or always turn on (both modes do not have smart switching functionality). USB C Rechargeable: The bicycle backlight alarm is powered by a built in 3. 7V 700mAh lithium battery and uses version 4 power saving technology, which can work up to 65 hours (in normal light mode) with about 3-8 months of standby (depending on operating frequency). Note: Charge it using the USB C charging cable and DC5V power adapter included in the package. 2 Mounting Methods: Equipped with mounting bracket, tie strap, suitable for 2 mounting methods. Bracket installation is suitable for pipe installation location. Tie belt installation is suitable for irregular installation objects. Easy to install. Search Function And Waterproof: Bike search function, easy to find your bike remotely in the parking lot, 3 ringtones for you to choose from. This function can also be a bicycle horn function. IP65 waterproof, do not worry about rainy days.