WIDE FIELD of VIEW : 180 Degree field of view degree wide angle design, the led bike light will make you more visible for other road users in dark night or daytime. It will be great for your extra security in ridingequipped with ultra bright wide beam LED, will make you more visible for other road users. INTELLIGENT BRAKE SENSOR: A build-in integrated accelerometer ensures accurate brake detection. With the brake sensor, Automatic ultra bright brake light will automatically light up after braking.The bicycle light is super bright and highly visible from a distance, really catch attention to enhance your safety. SENSING FUNCTION: In Fast Flash and Breathing mode with light sensor, the flashing light will turn on automatically in low brightness and turn off in high-intensity light. Save your time to switch the bike tail light WATERPROOF & RECHARGEABLE: IPX5 waterproof bike tail light against splashing water from any angle. Built-in 400mAh Polymer Lithium battery comes with a USB cord that charges from your computer, wall charger, power bank or any other device with a USB port. After charging for 2 hours, the tail light can work for 2550 hours in different modes. Please charge in time when the power is low. Long-term low power will damage the battery and cannot be recharged. EASY INSTALLTION: Saddle mounting and Seat Post mounting offered fit on any road bikes.Saddle mounting bracket and adjustable silicone strap provided, make the bicycle rear light flexible to quick install or detatch on bicycles, seat post, helmet. Very convenient to unscrews from the mount cap for recharging