Features 1、Horizontal and vertical, user-friendly design, gently swing the buckle handle, the taillight can be placed horizontally or vertically, can be installed tail for better warning. 2、Small size, carry around, mini exquisite, do not add burden to riding. 3、Applied electromagnetic induction, no need to charge, no battery, the tail light is automatically illuminated during riding, the faster the speed, the brighter the tail light. 4、Strong magnet, high absorption strength, install the strong magnet on the spoke, and adjust it to the position of ≤5mm with the sensor, you can excite the best power generation luminescence effect. 5、Life-grade waterproof, made of high-quality materials, sealed and processed, with waterproof effect, ensures the service life of the product, do not immerse the light body in water for long time. Condition: 100% brand new Item type: Self-Generating Electricity Bike Tail Light Material: plastic Color: As picture shown Size: Approx. 53x19x32mm/2.1x0.7x1.3in Weight: Approx. 72g Charging: no need to charge Installation location: bicycle seat tube Waterproof: daily waterproof Applicable models: round spoke wheel, flat spoke wheel Work time: Continuous work time Package List 1 x Self-Generating Electricity Bike Tail Light 1 x Magnet 2 x Plastic ring 2 x Plastic bracket 2 x Plastic accessory 1 x Turns line 1 x Instruction