Feature 1Large LED screen can accurately display time, it is convenient and practical to use. 2It can display the temperature inside and outside the car at the same time. 3The measurable temperature range inside and outside the car is between minus -50 and 70 . 4A system that can switch between 12 or 24 hours to display time. 5When the temperature is below -1 , the ice warning pattern lights up.Features: 1. Large LED screen can accurately display 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 time. 5. When the temperature is below -1 , the ice 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: Automobile Thermometer Material: ABS Battery: CR 2032 Button Battery (Not Include) 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 Automobile Thermometer 1 x Instruction Usage: 1. Plug into the car cigarette lighter, and place the outdoor probe on the inside of the car outer 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 between -1 and 4 degrees, the ICE display pattern will show that the temperature outside the car is low. Pay attention to the anti-freeze maintenance of the car. 3. Push the side switch to switch between blue and orange backlight colors. 4. If the display is abnormal due to some other factors, please take out the battery and reinstall the battery after a short time, or press the "RESET" button with a fine object to reuse it. Time Setting: 1. In the general TIME state, press and hold TIME button for 3 seconds, and then 12Hr or 24Hr blink to indicate the TIME setting state. At this point, press the UP or DOWN key to select the 12 or 24 hour display standard. 2. Press TIME to set the following functions: 12/24 hour - seconds - hours, minutes, year - month - date - confirm the exit. 3. Press UP or DOWN for up-down or down-down. 4. In the general TIME state, press TIME once to convert to the display state of month and date. 5. Hold down the key for 3 seconds to convert C and F. 6. Press and hold the button for 3 seconds to turn on or off the freezing alarm function (snow pattern appears when it is turned on).