Smart Brake Sensor- Built-in accelerometer ensures accurate brake detection. When the brake is detected, the super bright auto brake light will turn on for 5 seconds, enter a slow flashing state, stop for 10 seconds and turn off automatically. The bicycle light is super bright and clearly visible from a distance, it really attracts people's attention to improve your safety. 7 lighting modes: The bicycle taillight supports 7 modes, 3 flashes, 3 constant lights and 1 breathing light. Press the power button once to turn on the taillight. Then press the power button in turn to turn on the lights. It is very suitable for use at night and on rainy or foggy days. Ultra bright and waterproof: Our road bike rear light is IPx4 water and dust resistant, it works great to keep you safe even in heavy rain and fog. 180 wide field of vision with visibility up to 200m, it will be ideal for your extra safety in the saddle with super bright wide beam LEDs, making you more visible to other road users. USB Rechargeable: It comes with a USB cable that charges from your computer, wall charger, power bank, or any other device with a USB port. It also works as a safety light, you can mount it on your helmet, skateboard, pannier, backpack, etc. Easy InstallationSaddle assembly fits perfectly in any any road bike. Supplied saddle clamp bracket and adjustable silicone strap make the bike taillight flexible for quick installation or locking onto bikes, seatposts, helmets. Very convenient to unscrew from the mounting cap for filling. 1. IPx4 protection and can adapt to all kinds of harsh outdoor environments.The bicycle taillight supports 7 modes, 3 flashes, 3 constant lights and 1 breathing light. 2.In the mode of intelligent braking, when the product detects that the bicycle has a braking behavior, all the lights will flash in a flashing state to remind the rear vehicles to pay attention and keep lighting. 3.In the mode of intelligent braking, when the product detects that the bike is stationary for ten seconds, it will turn off all LEDs and enter sleep state to save battery power. Light display: Press the power button once to turn on the backlight. Then press the power button once to turn on the lights. There are 3 flashing modes, 3 brightness for long light, 1 breathing light and 7 light modes in total. IPX6 Waterproof: Waterproof with IPX6 rating, the bike lights are suitable for all types of weather, whether foggy or rainy, the bike lights will provide you with visibility lights for added safety and protection in bad weather . Product size: 4.4*3.4cm Shipping quantity: 1 piece.