- 2-in-1 Design: Combines a car voltmeter and thermometer in a compact, portable unit, perfect for on-the-go use. - Frost Alarm Function: Alerts you when the outside temperature drops between -1 and 4 degrees Celsius. The frost alarm icon flashes continuously for 30 seconds, helping you protect your vehicle from freezing conditions. - Versatile Usage: Serves as a precise voltmeter, providing accurate, real-time readings of your car battery's voltage on a clear LCD screen. Additional features include a calendar, alarm clock, and snooze function for enhanced convenience. - High Precision Measurement: Equipped with a 2-meter wired temperature sensor, this device accurately measures indoor and outdoor temperatures with a precision of ±1.0 degree. Easily switch between Celsius and Fahrenheit displays to suit your preference. - Clear LCD Display: The high-brightness LCD screen shows hours, minutes, indoor temperature, outdoor temperature, and voltage simultaneously. Choose between a 12 or 24-hour time format for easy readability. Use Scenarios: 1. Monitor your vehicle's battery status during long road trips to prevent unexpected failures. 2. Use the thermometer feature to ensure safe driving conditions in cold weather, allowing you to take necessary precautions. 3. Keep track of indoor temperature while camping or in your garage, ensuring comfort and safety in various environments.