Product informationMaterial: LED lamp beads, ABS engineering plastics, components, etc.Battery: 1 CR927 button batteryLine: switch designMode: flashingApplication: Bicycle with 2mm round spokesFeature* No need to change the line, just follow the line on the wheel;* One wheel can have one more card, and the blue and red combination is even more cool!* Switch design, from bright to bright* Bright on both sides, greatly improving driving safety;* Good waterproof performance.