Powered by solar or battery: The Car Digital Clock uses a quality solar panel and a temperature resistant lithium battery, enabling operation from solar power or battery power. Easy to use with vibration sensor: A builtin vibration sensor automatically turns the clock on when the car is in motion and shuts down after parking for a period, providing hands operation. Reliable and durable: The clock housing is made from temperature resistant material to safeguard the internal components against hot invehicle environments, reducing worry during summer heat. Changeable brightness for readability: The LED digital tube display offers clear visibility in both daytime and nighttime conditions. Automatic brightness adjustment provides bright daytime display and soft nighttime illumination. Use scenarios: Daily driving: The clock stays powered by solar or battery and activates automatically with vehicle movement, giving you reliable timekeeping without manual operation. Long trips or parking in sunlight: Daytime solar charging helps maintain power, while the auto on/off feature reduces unnecessary battery drain when parked. Hot climate vehicles: The temperature resistant housing protects the clock in extreme heat, ensuring consistent performance. Brandconsistent features and performance: Function: Solar or battery power, automatic on/off via vibration sensor, autoshutoff after parking, ambient brightness adaptation. Material: temperature resistant housing designed for incar use. Display: LED digital tube with automatic brightness control for day and night readability. Size and compatibility: Compact dashboard clock designed for universal car use.