Fangrui Product Details 1. Car Digital Display Clock Luminous Electronic Thermometer Voltmeter 2. Display On The Same Screen: Hours, Minutes, Seconds, Indoor Temperature, Outdoor Temperature And Voltage (the New Model 7013v Has Removed The Seconds And Day Of The Week Functions, Please Be Informed) 3. Can Switch Between 1224 Hour Format 4. Equipped With Alarm Clock And Snooze Function 5. The Temperature Can Be Switched To Display Celsius Or Fahrenheit. Temperature Measurement Range: -50~70 Degrees Celsius. The Temperature Measurement Sampling Period Is 20 Seconds. 6. Led Backlight Function, When Powered By A Car, There Is Backlight, And The Lcd Displays All Content; When Powered By A Backup Battery, There Is No Backlight, And The Lcd Only Displays The Time. 7. Car Battery Indication Function: 12v 8. Frost Alarm Function: On The Interface That Displays The Time, Press And Hold The Celsius Or Fahrenheit Switch Key For 2 Seconds To Turn On Or Off The Indoor And Outdoor Frost Alarm. When The Frost Alarm Function Is Turned On And The Temperature Is Within The Range Of -1 To 4 Degrees Celsius, An Alarm Will Sound. 30 Seconds Alarm, Its Logo Will Flash 9. Datetime, Weeksecond Display Function, 1224 Hour Format Conversion 10. Dimensions: 15.5x4.5x2.2cm