4in1 Led Digital Clock jam Date Voltmeter Volt Thermometer Temperatur

New Coming Mini Car Digital Clock Thermometer Voltmeter 4 IN 1 Meter Electronic INterior LED Display Digital Timer VoltmeterType: Car clock/Thermometer/Voltmeter/Date   Material:Plastic Color:Black Light Color: Red Quantity:1pc Input voltage: 5 ~ 20V (to use the voltmeter function, the input voltage is at least 7V or more) Voltmeter range: 7 ~ 20V, error ± 0.1V Temperature measurement: -50 to 130 degrees Working current: 30MA Item Size:4*1.3*1.4cm/1.6*0.5*0.6 #34;(L*W*H)   1.There are three functions,Set time, temperature and voltage 2.Three functionscan be switched at any time. 3.Total 4 kinds of display modes.  4.Only display time/only display temperature/only display voltage/three of functions alternate display (Note: in the alternatedisplay mode, can choose whether to display the temperature or voltage,through the dd option under the condition of dd:0 display time + temperature+ voltage. dd:1 display time + voltage. dd:2 display time + temperature). 5.Manual correction function with temperature error, setting range of -5~5. 6.With a backup battery, power down time to continue to go.   Package includes: 1 x Digital Car 4in1 Meter