Bicycle Rear Light Brake Sensor Red Intensity Bicycle Taillight 6 Modes Weather Resistant Red Bike Light Rechargeable Bullet Points: 1.Multiple Lighting Modes: When in smart mode, our Smart Bike Tail Light uses a light sensor function to adjust its 6 lighting modes. It has a 100 lumens maximum output. 2.Auto Off Light: Equipped with motion sensors, this smart bike tail light automatically turns on at full brightness for 3 seconds when braking in any mode. It also turns off automatically if the bike doesn't move for 5 minutes, saving battery life. 3.Easy to Install: Long press to power on/off and single press to switch lighting modes; installing this Smart Bike Tail Light is a breeze. Mount it under the seat tube or seat rail of bikes with 22-33mm diameter using the adjustable silicone tape or seat rail mounting seat for versatility. 4.Effortless Charging: Charge it in only 40 minutes using the included Type-C cable and any USB port. It lasts up to 120 hours in energy-saving mode, so you'll be able to ride with peace of mind, knowing you're always prepared! 5.Water Resistant Design: The smart bike tail light has an IPX6 waterproof design that can withstand light rain and splashes (do not immerse in water). It is also impact-resistant and can endure rough terrain and bumps. Illuminate your rides with our rechargeable bike light! Choose from 6 lighting modes and stay safe with the smart brake sensing design. Easy to install under 22-33mm seat tube or seat and features USB charging design. Can be used in light rain (do not immerse in water). Specification: Name: Smart Bike Tail Light Size: (approx.)3.2*3*3.2cm/1.26*1.18*1.26 inches Gear: 6 gears Endurance: 12 hours - 60 hours Battery capacity: 400mAh Charging input: 5V-0.28A Waterproof rating: IP66 Packing List: 1* Smart Bike Tail Light