Wide Field of View: With a 180-degree wide-angle field of view, the LED bike light will make it easier for you to be seen by other road users at night or in the dark of the road. ride with extra large LEDs and wide beam is very useful for your extra safety, which will make you more visible to other road users. Intelligent brake sensor: the integrated accelerometer allows precise brake detection. With brake sensor, ultra-bright auto brake light turns on automatically after braking. Bike lights are bright and noticeable from afar. Really attract attention to improve your safety. Sensing Function: In rapid flash and breathing mode with light sensor, the flash automatically turns on when light is low and turns off when light is high. Save time by turning on your bike's taillights Waterproof & Rechargeable: The IPX5 waterproof bike tail light protects against splashing water from all angles. The built-in 400mAh Li-polymer battery comes with a USB cable and can be charged from your computer, charger wall charger, mains charger or any other device with a USB port. After 2 hours charging, the tail light can work for 25-50 hours in different modes EASY TO INSTALL: Saddle and seatpost brackets fit all road bikes. Saddle mount bracket and adjustable silicone straps included make the bike tail light flexible for installation or fixing fast to bikes, seatposts and helmets. Easy to unscrew from mounting lid to reload 100% new high quality, made of aluminum, lightweight and durable, giving you super performance. Built-in accelerometer ensures accurate brake detection. During sudden deceleration or braking, the warning light comes on automatically to warn vehicles behind. Power indicator, four small flashing blue lights to remind you to charge, you won't have any trouble when walking around without electricity. Clip anywhere on belts, running gear, reflective vests, backpacks, dog collars, harnesses or clothing. Ride a bike, helmet, skateboard, scooter, stroller, wheelchair rolling or anywhere else you can imagine.