1、6 Light Mode: There are 6 light modes for your choice, steady, breathing flash, slow flash, endurance flash, rhythm flash, fast flash. You can enjoy your cycling as you wish. Bike taillight makes you more visible, it's a perfect bike light for night riding. 2、Intelligent Sensing Chip: Accurately detects braking. The tail light will automatically illuminate for 3 seconds, conveying deceleration information to the rear and increasing safety warning. 3、Rechargeable Bike Tail Light: Smart bike tail light has a built in USB charging port (USB cable included). When the indicator light is red, please charge. It will turn green when fully charged. 4、IP66 Waterproof Bicycle Tail Light: This bike rear light has a nice touch and awesome appearance. It's waterproof, dustproof and shockproof, suitable for any harsh working environment. 5、Safety Light: Easy to install. Lightweight and durable bicycle tail light that can be mounted on all bicycles, children's bicycles, adult bicycles, handlebars, seat posts, dog collars, or anywhere else. Can also be used as a helmet light, backpack light, warning light, etc. Item Type: Smart Bike Tail Light Material: ABS, Electronic Components Weight: Approx. 65g / 2.3oz Battery Type: Lithium Battery (With Built In Battery) Battery Capacity: 400mAh Waterproof Level: IP66 1 x Smart Bike Tail Light 1 x Charging Cable 4 x Cable Ties 3 x Rubber Stickers 3 x Accessories 1 x Instruction Manual