clock, voltage of automotive battery, temperature are displayed on the same screen. Please noted that it indicates that the memory button cells are going to lose efficacy soon if the displaying time is incorrect or machine resets after automobiles get . Please replace new battery at once. Features - Color: Shown in the pictures. - Material: Plastic. - Size: Approx. 10 x 10 x 5cm/ 4 x 4 inch (LxWxH). - clock, voltage of automotive battery, temperature are displayed on the same screen. - Temperature measuring Scope: -30 degree centigrade-80 degree centigrade. - Temperature displaying resolution: 1 degree centigrade. - Sample period for temperature measuring :1 degree centigrade. - testing scope of the voltage of automotive battery: DC9-3 , apply type DC 12V/24V. - USB charging port is provided ,output voltage DC 5. , maximum output current 2.1A. - Button Operation 1.Hour button: press Hour button for 2ssconds, the figure representing hour blinks, then press UP or Down Button to adjust hours, then press Hour button to finish hour setting and exit. 2.Min Button: Press Min button for 2 seconds,the figure representing minute blinks, then press UP or DOWN button to adjust minutes,then press Min button to finish mintute setting and exit. 3.UP button: Up-regulation button, operated with hour and minute button. 4.DOWN Button:Down-regulation button , operated with hour and button. Package list: 1 x 3 in 1 12-24V Car Vehicle Digital Clock Thermometer Voltmeter Electronic Voltage Thermometer Clock