Description:Measure and display the temperature (Celsius) in your vehicle as well as the outside temperatureWorks with 12V vehicles, voltage displayConnects to your car's cigarette lighter chargerLCD digital display, easy to readCharacteristics:Manufacturer NumberCT-53011-AS supply: 12VHousing : CampusTemporary parking phone number12V voltage measurementIndoor and outdoor temperature:Internal temperature range: -20 ~ + 70 CExternal temperature range: -50 ~ + 70 C : +/- 1.5 CGlaze alarm: 0 to 4 CClock / year / month / dateOrange and background : 1xCR2032 (not included)Dimension: 11.5x3x4cm (LxWxT)Sensor Cable Length: 1.5mWeight: 115gHow to use:1. Connect the plug to the car cigarette socket, put the temperature sensor outside and hang it on the edge of the car door, then run the car.The product will display the interior temperature (shown in the icon) and the voltage of the car .2. Press up / down to s to the time display.3. the outdoor temperature is below 0 to 4 C, the ice icon will be displayed.4. The number on the right side is the voltage of the car .5. Press the button on the side to change the backlight to and orange.6. If there is any abnormal display, please take out the for a while and recharge it.Package list:1 x main unit ( not included)1 x phone number card1 x User