Features: The screen displays time, alarm clock, indoor and outdoor temperature, temperature trend, calendar, frost alarm.Alarm clock indicates health to wake up the cortex. The time display can be switched between 12 hours and 24 hours.For outdoor testing, travel testing.Check the indoor temperature at home every day and live a healthy life. Indoor and outdoor testing, safe driving.Office tests help create a comfortable office environment.One-button backlight, soft eye protection. The backlight is bright at night, so you can quickly access the time.During the day, the backlight is illuminated with soft brightness. Specifications: Product size: approx. 85 x 24mm/3.34 x 0.94in Product battery: 2 x AAA batteries (not included) Screen size: approx. 8.5cm x 4cm/3.35 x1.57 inch Cable length: about 240cm Power supply mode: two AAA batteries Temperature range: -18°C~50°C, -64.4°F~122°F. Time function: time setting'alarm.Temperature function: dual temperature (in the car).Features: Outdoor frost alarm.Night Light Support: Yes Package Includes: 1 x Car Clock Thermometer