SODIAL(R) Car Alarm Temperature Thermometer Clo ck Voltage Monitor Meter Date/Hour Week/Second Display. Switch the display between 12-hour and 24-hour Alarm Clock. Snooze function with 5 minutes interval. Switch Temperature display in ?C or ?F Measure temperature measurement range: -50?C-70?C Sampling period of thermometer 20 seconds. Car battery voltage indicator. LED backlight with double colors optional? LED backlight is on and lcd show all with automotive power. No backlight and LCD screen only show time with spare battery power (not included)