Specifications: Display Information: Time, Indoor Temperature, Humidity Dial Display: Digital Placement: Dashboard Origin: Mainland China The device is equipped with double-sided adhesive. Please clean the surface before application. Position the solar panel toward a light source to enable continuous charging. Solar Clock Instructions: 1. Push the slide switch on the back of the unit upward to turn on the power. 2. Slide the switch again to change the backlight color. 3. Insert a Type-C charger into the port on the side to charge the device and keep the backlight continuously illuminated. 4. Time setting procedure: A. Press UP/DOWN to switch between °C and °F. B. Press and hold the SET button for 3 seconds to enter time setting mode. Press SET to cycle through settings: hour → minute → year → month → date → confirm. C. While in setting mode, use the UP/DOWN buttons to adjust values. 5. Press the SET button to toggle between 12-hour and 24-hour format. 6. Press the O button to activate the key light for 5 seconds. 7. In low-light conditions, the backlight will automatically illuminate when motion is detected (solar model only). In bright environments, the backlight will turn off automatically. 8. Based on current readings, the device displays comfort indicators: - Temperature: HOT, comfortable (smiley), COOL - Humidity: DRY, comfortable (smiley), WET Note: For prolonged vehicle operation (e.g., transport vehicles, commercial vehicles, taxis), a button battery backup is recommended when solar charging is insufficient. Package Includes: 1 x Car Clock Thermometer