Maintain your car based on real-time data. This car voltage meter clock thermometer is a multi-function clock with 4 in 1 function, including time, thermometer, voltmeter and backlight. It can effectively inspect your car in real time. There is an alarm lamp to remind you to avoid frost damage to your car as the temperature drops to the freezing point. There is a voice alarm and a lamp to remind you to check the battery when the voltage is too low or too low. You can maintain your car Special function: Time display (12/24 hours), date display, dual temperature display, alarm clock, snooze function, anti-freeze alarm function, car battery voltage display, LED car with backlight, if running on backup batteries, there would be no backlight. Car battery voltage alarm warns you of your car battery voltage and its sensor alarm warns you of overvoltage or undervoltage operation Real-time display When connected to the car, the backlight will light up and all contents (including time,