SMART BIKE TAILLIGHT WITH ALARM - Not just a bike taillight but also a hidden anti-theft alarm for your bicycle. This bike taillight has a built-in motion sensor and vibration alarm, can effectively deter thieves with a 110dB loud alarm, providing extra security and giving you peace of mind when your vehicles are parked outdoors. 7 levels of adjustable vibration sensitivity from light touch to push or hit, you can easily adjust the sensitivity according to your needs. SMART BIKE BRAKE LIGHT - Automatic bike brake light with built-in G-sensor. When you brake, the taillight will automatically light up brightly for 2 seconds to warn other drivers behind you, effectively avoiding rear-end collisions and traffic accidents. ULTRA BRIGHT BIKE TAILLIGHT WITH 4 MODES - 160 lumens super bright and 270 degree extra wide bike taillight with powerful flashes warns motorists at night and during the day, improving your visibility and safety. Slow flash/Breathing/Fast flash/Solid light/OFF, 4 light modes are easily selected with the wireless remote control. SMART AUTO ON/OFF - Don't worry about the bike taillight turning on automatically when you sleep at night. Built-in light sensor and motion sensor. In Slow flash and Breathing modes, the taillight automatically turns off after 30 seconds of inactivity in dark environments and turns on when motion is detected. In bright environments, it automatically turns off to save power, if you need the taillight during the day, you can choose Fast flash/Solid light (these 2 modes do NOT have smart on/off function). USB C RECHARGEABLE - The bike taillight alarm is powered by a built-in rechargeable 4.2V 700mAh lithium battery and uses the 4th version of energy-saving technology, about 3 hours of full charge can work up to 65 hours (in solid light mode), standby time about 4~8 months (depending on the working frequency). Note: Please use the included USB C charging cable and your DC5V power adapter to charge it. 2 INSTALLATION METHODS - Comes with mounting bracket, zip ties for 2 installation methods. Bracket installation suitable for tube installation. Zip tie installation suitable for irregular mounting objects. Easy to install. An affordable and practical bike accessory. FIND VEHICLE FUNCTION & WATERPROOF - Vehicle finding function, easy remote control to find your vehicles in the parking lot, 3 types of bells to choose from. This function can also be a bike horn function. IP65 waterproof, don't worry about rainy days.