With a hybrid power supply of solar and LR44 button batteries, unsightly wiring is unnecessary. The vibration sensor automatically turns on the backlight at night. It turns off automatically when the vehicle stops. The light sensor prevents the display from lighting up during the day, saving battery power. The large LCD display provides excellent visibility. 12-hour/24-hour and Celsius/Fahrenheit display options are available. *The characters are black. The backlight is blue. Please refer to image 6 for the actual display. Please note that the packaging may have some damage. We are also selling items with orange backlights, so please choose according to your preference.