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. 1 x Self-Generating Electricity Bike Tail Light1 x Magnet2 x Plastic ring2 x Plastic bracket2 x Plastic accessory1 x Turns line1 x Instruction Condition: 100% brand newItem type: Self-Generating Electricity Bike Tail LightMaterial: plasticColor: As picture shownSize: Approx. 53x19x32mm/ 2.1x 0.7x 1.3inWeight: Approx. 72g Charging: no need to chargeInstallation location: bicycle seat tubeWaterproof: daily waterproofApplicable models: round spoke wheel, flat spoke wheelWork time: Continuous work time