The car cigarette lighter plug car cigarette lighter plug and an outdoor probe is placed inside of the car door fixed,open cars,the display shows the current temperature inside the car (there are marked IN) and battery voltage within.
Press the IN / OUT key to display outdoor temperature (OUT has shown).
When the temperature outside the vehicle is below -1 degree,ICE indicator will light, prompting you outside temperature is low, pay attention to anti-icing vehicle maintenance.
Pushing the side of the switch,you can switch between blue, orange backlight colors.
Such as the use or because of some other factors that affect the display abnormal,can also be tapered object press "RESET" button (back of the product), you can re-use.