Features: HIGH BRIGHTNESS - It has 4 blue light-SMD, 5 red light-SMD of 10-15LM and 30 yellow light-SMD. It offers high brightness for you but not dazzling in foggy/rainy day or even in dark night. REMOTE CONTROL 4 Modes - There are 3 easy to use buttons on the controller. You can remote control the turn lights on handlebar to send signals for added safety in 4 different modes during riding. USB RECHARGEABLE - Our rear bike light use 500mAh Li-ion battery, It can work for about 4-5 hours. Stop wasting money on batteries again. Coming with a charging cable, it can be charged from your computer, power-bank or other USB devices. DAILY WATERPROOF - Our bike rear light is daily waterproof. Designed for outdoor activities. Suitable for Mountain, MTB and Road Bicycles. EASY TO USE - Combine the rear light and the controller with the corresponding mountings. It can also be used on bicycle, helmet, skateboard, scooter, stroller, wheelchair, etc.