How to Use: 1. Long press the label button on the back and it will flash for about 2 seconds, indicating that it is powered on. 2. Only in a dim place (at night), plus vibration (when driving) will it be sensitive to light. 3. It will automatically go to sleep and turn off the light if it does not move for 20 seconds, and it will light up again when it moves again. 4. Long press the button for 4 seconds and the light will turn off. 5. The light does not turn on after a period of use because it is out of power and needs to be exposed to the sun for charging. 6. When the light is too strong during the day, it will not be bright, and it will be bright at night or in a dim place. Specification: Item Type: Car Coaster Material: Acrylic + Solar Panel Quantity: 2pcs Diameter: Approx. 6.8cm / 2.7in Package List: 2 x Car Coaster