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 day . Riding with extra large and wide beam LEDs is very useful for your extra safety, which will make you more visible to other road users. Smart brake sensor: the integrated accelerometer allows a accurate brake detection. With brake sensor, ultra-bright auto brake light turns on automatically after braking. The 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 will automatically turn on when the light is low and turn off when the light is high. Save time turning on your bike taillights Waterproof & Rechargeable: IPX5 waterproof bike taillight 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, wall charger, mains charger or any other device with a USB port. After 2 hours of charging, the rear 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 included adjustable silicone straps make the bike taillight flexible for quick installation or attachment to bikes, seatposts and helmets. Easy to unscrew from the mounting cover to reload 100% new high quality, made of aluminum, lightweight and durable, giving you super performance. L Built-in accelerometer ensures accurate brake detection. During sudden deceleration or braking, the warning light will automatically come on to warn the vehicles behind. Power indicator, four small flashing blue lights for you remind to charge, you will have no problem when walking around without power. Clip anywhere on belts, running gear, reflective vests, backpacks, dog collars, harnesses or clothing. Ride a bike, helmet, skateboard, scooter, stroller, wheelchair, or anywhere else you can imagine.