Features: 1. Our tirecap lights are designed for bikes, cars, and motorcycles. 2. More energy-efficient, with light & motion sensors. 3. Waterproof, durable, high impact, rust-resistant. 4. Auto shining with no switch, LED auto turn on when moving. Installation precautions and solutions to common problems: 1: The steam wheel consists of three AG10 batteries. When installing, please align the positive and negative poles correctly, no word end face spring 2: Be sure to put the battery into the black insulating holster, do not expose it, otherwise, the battery and the metal of the lamp housing will be short-circuited, which will cause the battery to discharge and heat up, and the battery will heat up. The power went out after a few minutes. 3: Be careful when twisting the lamp head. Make sure the metal strip in the groove on the edge of the light head is in good contact with the metal base (e.g. if the metal is too close to the inside, you can manually pull it out a bit, but be light!) 4: If the hot wheel does not light up under normal conditions, please adjust the length of the spring to ensure that it is in full contact with the battery (do not use too much force, it is easy to cause the spring to fall off), otherwise it will not light up. Specification: Name: TireCap Lights Color: blue/red/green/color Material: rigid PVC Applicable: electric car/motorcycle/car/bike (beautiful mouth/english mouth) Power supply: three AG10 electronics (self-contained) Power source: button battery Product list: 2* TireCap Lights