Features 1. Equipped with a large data display screen for clear, accurate, and easy-to-read information 2. Supports display of year, month, day, hour, minute, and weekday; offers 12/24-hour format conversion and Celsius/Fahrenheit temperature unit switching 3. Provides wide-range temperature measurement and indoor humidity measurement with user-friendly operation 4. Includes a 1-minute alarm and 5-minute snooze function; allows custom alarm settings 5. Features a vehicle power supply with backlight; low power consumption for energy efficiency and environmental protection 6. Supports high and low temperature and humidity alarm settings; displays moon phase and weather forecast information 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 'MODE' button in normal time mode to switch between functions: current time, alarm status, date, lowest temperature/humidity, highest temperature/humidity, and indoor/outdoor temperature/humidity 2. Press the 'RECEIVE' button in normal time mode to view highest and lowest temperature and humidity settings 3. Press the 'SET' button in normal time mode to switch between Celsius and Fahrenheit Time Setting 1. Press and hold the 'SET' button for 2 seconds in normal time mode to enter time setting 2. Press the 'RECEIVE' button to toggle between 12-hour and 24-hour display 3. Press the 'SET' button to make minutes flash; press 'RECEIVE' to increase minute value, long press to adjust faster 4. Press the 'SET' button to make hours flash; press 'RECEIVE' to increase hour value, long press to adjust faster 5. Press the 'SET' button to confirm and exit Alarm Setting 1. Press the 'MODE' button in normal time mode to enter alarm setting 2. Press and hold the 'SET' button for 2 seconds to enter alarm setup; alarm indicator will flash 3. Press 'RECEIVE' to toggle alarm on/off, chime on/off, or set hourly chime 4. Press 'SET' to make minutes flash; use 'RECEIVE' to adjust minute value (long press for faster adjustment) 5. Press 'SET' to make hours flash; use 'RECEIVE' to adjust hour value (long press for faster adjustment) 6. Press 'SET' to confirm and return to normal time 7. When alarm activates, press any button to stop; press 'ADJUST' to snooze, which will pause for 5 minutes Date Setting 1. Press the 'MODE' button twice in normal time mode to enter date setting 2. Press and hold 'SET' for 2 seconds; year will flashuse 'RECEIVE' to adjust (long press for faster adjustment) 3. Press 'SET' to make month flashuse 'RECEIVE' to adjust 4. Press 'SET' to make date flashuse 'RECEIVE' to adjust Indoor/Outdoor Temperature Switching 1. Press 'MODE' five times to enter temperature source setting; 'INT' (indoor) or 'EXT' (outdoor) will flash 2. Press 'RECEIVE' to select between indoor ('INT') and outdoor ('EXT') temperature display 3. Press 'MODE' to confirm and return to normal time display Other Functions Package List included as listed above