Smart Bike Tail Light, Brake Sensing Bicycle Rear Light, Waterproof Bike LED Back Lights, Auto On/Off, USB Rechargeable, Ultra Bright Taillight for Bicycle, Road Mountain City Commuting Cycling Safety - YBLNTEK

• Ultra Bright COB LED & Mutiple Lighting Modes -- With high lumen COB LED, make you more visible when riding. Four lighting modes are optional for use on mountain cycling or daily commutes: ①Normal Flash Mode ②Breathing Flash Mode ③Fast Flash Mode ④Steady On Mode. Designed for various riding condition. Smart Brake Light & Auto On/Off -- Equipped with Motion & Light Sensors, once you brake or slow down, the brake light will turn on for 3s to alert drivers and passengers, the brightness is 3 times higher than normal. On smart mode (Normal Flash/ Breathing Flash), the smart light will auto turn on or off based on ambient brightness. In darkness, if you stop for more than 30s, it will auto turn off, if you ride again, it will auto light up. In bright areas, auto turn off to save energy. Fast-Charging & Long Battery Life -- Built-in rechargeable 300mAh lithium battery and Type-C charging port, fully charged in just 1.5-2 hours, keeps running for 8-36 hours. The bike back light can be charged via computers, chargers, power bank or any other device with a USB port. Just make sure USB port cover is snapped shut when fully charged, and you're all set – no worries about rain getting in charging port. Easy Installation and Disassembly -- Easy to install with the included bracket, strap and tie. Saddle mounting bracket and adjustable silicone strap provided, make the bicycle rear light flexible to install or detatch on bicycles. Very convenient to rotate out from the bracket. Both seat-post mounting and saddle rail mounting can securely fix taillight to bicycle. Additionally, the bicycle back light can be mounted on bike seat bag which has hanger. IPX6 Waterproof & Rugged -- Crafted of premium PC+ aluminum alloy material with IPX6 waterproof rating, which can withstand diverse weather condition. Ultra impact-resistant, shockproof and anti-drop, this bike light survives your wildest rides! it is a reliable companion for your cycling adventures.