Characteristics: 1. The large LED screen can accurately display the time, it is convenient and practical to use. 2. It can display the temperature inside and outside the car at the same time. 3. The measurable temperature range inside and outside the car is between minus -50 ℃ and 70 ℃. 4. A system that can switch between 12 or 24 hours to display the time. 5. When the temperature is below -1 ℃, the icing warning pattern lights up. 6. Real-time monitoring of battery voltage in the car, digital display of current voltage to ensure safety. Specification: Item Type: Car Thermometer. Material: ABS Battery: CR 2032 Battery Button (not included) Fitment: Universal Measurable temperature range: -50 ℃ - 70 ℃ Size: Approx. 108 x 80 x 42mm / 4,3 x 3,1 x 1,7in Package List: 1 x Car Thermometer 1 x Manual Usage: 1. Connect to the car cigarette lighter, and place the probe outside on the inside of the car exterior door fixed, open the car start, the display screen shows the current car inside and outside temperature and battery voltage and time inside the car. 2. When the temperature outside the car is from -1 to 4 degrees, the ICE display pattern will show that the temperature outside the car is low. Pay attention to the antifreeze maintenance of the car. 3. Press the side switch to switch between the blue and orange backlight colors. 4. If the display is incorrect due to some other factors, please remove the battery and reinstall the battery after a short time or press the "RESET" button with a small item to reuse it. Setting the time: 1. In the general TIME state, press and hold the TIME button for 3 seconds, then 12Hr or 24Hr flash to indicate the TIME setting status. At this point, press the UP or DOWN button to select 12 or 24 hour standard display. 2. Press TIME to set the following functions: 12/24 hour - seconds - hours, minutes, year - month - date - confirm output. 3. Press the UP or DOWN button to select the up-down or down-down option. 4. In the general TIME state, press TIME once to convert to month and date display status. 5. Hold the button for 3 seconds to convert °C and °F. 6. Press and hold the button for 3 seconds to turn the freezing alarm function on or off (snow pattern appears when it is on).