ULTRA-BRIGHT BICYCLE REAR LIGHT WITH 4 MODES - 160 lumens super bright and 270 degree extra-wide bike taillights powerful flashes alert motorists at night and during the day, that enhance your visibility and safety. Slow Flashing/Breathing/Fast Blinking/Steady Light/OFF, 4 light modes easily selected by wireless remote SMART BIKE BRAKE LIGHT - Auto bicycle brake light build in G sensor. Once you braked the rear light will auto highlight for 2s to alert other drivers behind you, effectively avoid rear-end collisions and traffic accidents SMART BIKE TAIL LIGHT WITH ALARM - Not only a bike taillight but also a hidden anti theft bike alarm. This bike tail light build in motion sensor and vibration alarm, can help to deter thieves effectively by 110dB loud alarm, provide additional security and give you peace of mind when your vehicles park outdoors. 7 levels adjustable vibration sensitivity from gently touch to push or beat, you can easily adjust the sensitivity as your need SMART AUTO ON/OFF - No worry the bike rear light auto lights up when you sleep at night. Build in light sensor and motion sensor. On Slow Flashing & Breathing modes, tail light 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 tail light in day time, you can select Fast Blinking/Steady Light (these 2 modes have NOT smart on/off function) USB C RECHARGEABLE - The bicycle back light alarm is powered by a built-in rechargeable 4.2V 700mAh lithium battery and uses 4th version power-saving technology, about 3h full charge can work up to 65h (in steady light mode), standby time about 4~8 months (depend on the work frequency). Note: Using the package included USB C charging cable and your DC5V power adapter to charge it