Features:Time/Date display，12/24 hour system conversion. Alarm function Snooze function，snooze time:5 minutesCapable of switching temperature display unit °C / °F.Measure indoor&outdoor temperature， measurement range:-50°C~70°CThermometer’s resolution:1°C;accuracy: ±1.0°CTemp metering duration:20 secondsTwo colors of Backlight for choices.If the power is supplied by the car cigarette lighter when plugged，backlight is light up and all the contents(including the time， temperature and volt) will be displayed on the LCD screen. If the power is supplied by the backup battery when unplugged， there is no backlight and LCD screen will only display the time.Car battery voltmeterWorking voltage: DC 12.0V-24.0VNote:This item come with retail box. 100% Original brand new，