Features: - There is no requirement for riding speed, the manual switch is fully autonomously controlled and tool-free installation. - These cool LED bicycle rim lights are suitable for more bicycles than any other model, from 12-inch toddler bicycles to 29-inch adult bicycles. - Increases visibility from all directions, so you and your love are safer in low light conditions. Ordinary bicycle lights can only be seen from the front and back to avoid side injuries. With it, whether you are exercising or not, this bike can stand out from all angles. Specifications: Number of LEDs: 20 high-brightness LEDs (2M, 26 inch wheels per circle) Flashing mode: full light, slow flash, fast flash (press the switch to change) Power supply mode: 1 * CR2032 button battery(not included) Life time: always on for more than 20 hours, slow flashing for more than 50 hours Package included: 1* Wheel light Notes: 1. Manual measuring, please allow 1 ~ 3mm error,thank you. 2. Due to the difference between different monitors, the picture may not reflect the actual color of the item. We guarantee the style is the same as shown in the picture.