Features: 1.Date/time display - 12/24 hour free conversion 2.Alarm clock function & 5 minutes snooze function & Perpetual calendar function & LED backlight color selection function 3.Temperature can be switched to display / 4.Temperature can be switched to display / Car battery voltage indication function (DC12-24V) 5.Car Thermometer - Can be used for 12V cars, SUVs, and also for 24V trucks and buses specification: Date/time display - 12/24 hour free conversion Alarm clock function & 5 minutes snooze function & Perpetual calendar function & LED backlight color selection function Temperature can be switched to display / Car battery voltage indication function (DC12-24V) Car Thermometer - Can be used for 12V cars, SUVs, and also for 24V trucks and buses : Type: LED Car Thermometer Model: TS-7009VD Temperature measurement, measuring range: -50 -70 Temperature display resolution: 1 Temperature accuracy: +/-1.0 Temperature measurement sampling period: 3 seconds Battery: 2 * L1154F button battery (Included) Backlight function: Yes(There is backlight when using car power supply and LCD content is all displayed. And if powered by a backup battery, no backlight, LCD display time and internal and external temperature) Backlight color: Selectable Perpetual calendar function: YES Alarm clock function: YES Snooze function: YES Frost warning function: YES Car battery voltage indication function: YES Material: Plastic + Glass Voltage: DC 12-24V Display: LED display Weight: Approx. 111g Base diameter: Approx. 4.5cm / 1.8in Total height (plus base): Approx. 7.5cm / 3in Size: Approx. 9.2 * 5.5 * 2.8cm / 3.6 * 2.2 * 1.1in Package list: 1 * Thermometer 1 * User Manual 1 * Double-sided Ahesive Sticker 2 * L1154F Button Battery Note: Please allow slight error due to manual measurement. Thanks for your kind understanding.