Features: Configuration of large data display screen, data display clear and accurate, easy to observe. Support year, month, day, hour, minute and week display, 12 or 24 system conversion and Celsius, Fahrenheit temperature display switching. It has a wide range of temperature measurement, indoor humidity measurement function and simple use method. Configuration 1 minute alarm, 5 minutes sleepiness function, you can set your own alarm clock. With vehicle power supply backlight function, low power consumption, energy saving and environmental protection. Supports the highest and lowest temperature and humidity alarm settings, can display the moon, with weather forecast function. It can monitor the battery voltage in real time and display the current voltage digitally. The state pattern of the voltage indicates that when the voltage is too high or too low, there will be an alarm sound. Specification: Condition: Material: ABS Temperature Range: Outdoor: -50℃ To 70 ℃ (-58℉ To 158℉) Indoor: -10℃ To 60℃ (14℉ To 140℉) Application: Universal 12-24V Battery: 1 x 2032 Button Battery (Battery Not Included) Package List: 1 x Instruction Manual 1 x Car Clock (Battery Not Included) 1 x Bracket 1 x Cigarette Charger Instructions: 1. Press the ''MOTE'' button in the normal time to switch between the following functions: general time - alarm status - date status - lowest temperature humidity - highest temperature humidity - indoor and outdoor temperature or humidity. 2. Press the ''RECELVE'' button in the normal time to view the highest and lowest temperature humidity settings. 3. Press the ''SET'' key to switch between Celsius and Fahrenheit in normal time. Time setting: 1. Press and hold the ''SET'' button for 2 seconds in the normal time state to enter the time setting state. 2. Press the ''RECELVE'' button to switch the 12 or 24 hour display. 3. Press the ''SET'' button for a minute to flash, press the ''RECELVE'' button to increase the minute, long press to speed up the adjustment. 4. Press the ''SET'' button to flash the hour, press the ''RECELVE'' button to increase the hour, long press to speed up the adjustment. 5, press the "SET" button to return General time status alarm settings: 1. Press the ''MODE'' button in the normal time state to enter the alarm state. 2. Press the ''SET'' button for 2 seconds to enter the alarm setting state, and the alarm will flash. 3. Press the ''RECELVE'' button to display the alarm, turn on the overall harmonic, turn on the alarm and the whole point, turn off the alarm and the whole point. 4. Press the ''SET'' button, the minute flashes, press the ''RECELVE'' button to increase the minute value, long press this button to speed up the adjustment. 5. Press the ''SET'' button, the hour flashes, press the ''RECELVE'' button to increase the hour value, long press this button to speed up the adjustment. 6. Press the ''SET'' button to confirm the alarm setting and retur 1,Configuration of large data display screen, data display clear and accurate, easy to observe 2,Support year, month, day, hour, minute and week display, 12 or 24 system conversion and Celsius, Fahrenheit temperature display switching 3,It has a wide range of temperature measurement, indoor humidity measurement function and simple use method 4,Configuration 1 minute alarm, 5 minutes sleepiness function, you can set your own alarm clock 5,With vehicle power supply backlight function, low power consumption, energy saving and environmental protection Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.