COB LED+EnSca LENS - The bicycle tail lights can automatically adjust the lights field of view width which is according to your riding habits, and the visibility can up to 655ft. Reliable COB LED+EnSca lens maximize your visual presence, providing super brightness in both daylight and night but not dazzling. INTELLIGENT BRAKE SENSING - This rear bike light has a build-in high sensitivity acceleration sensor ensures accurate brake detection, automatically switch to brake light mode when decelerating with lights highlight to warn the approaching vehicles. DURABLE & IPX5 WATERPROOF - This Bicycle rear light use premium full CNC aluminum alloy, sturdy and durable. IPX5 waterproof rating, don't worry about splashing puddles or rainy weather. Works perfectly to ensure your safety even in heavy rain and foggy weather. USB RECHARGEABLE - The Bicycle led lights are built in 500mAh Rechargeable Li-ion battery, lasting 8-41 hours with one full charging of 2-3 hours, it can be charged by computer, wall charger, power bank or any other adapter supporting USB. Also works as safety light, you can mount to your helmet, skateboard, saddlebag, backpack etc. SIX WORKING MODES - There are two control modes (Manual light mode /Automatic sensing mode. With a Automatic sensing mode, this bike taillight will Auto On/Off) and 6 light modes (Always on mode/Breathing mode/4 Flashing mode) to choose. This means that MEIDI led light for bicycles has six working modes that allow you to confidently go out during the day or night. And it remembers the last setting so you don't have to scroll through each time.