Check the listing for details. 3 in 1 0.56" 4 Digits 200V LED Digital Voltage & Temperature Meter Thermometer. Condition: New. Listed at 12.46 USD. NOTE:This table needs to pick DC 7-30v power, red wire to positive and black wire to negative. Note that the DC Oh! Can not be directly connected to AC 220v.Triple temperature sensor wires default one meter, can not do prolong, after prolonged will affect the accuracy of time, if the parents need to extend the sensor cable, but not when using the watch, then it is no problem​Specifications:Feature:Multifunction, Clock,Voltage,Thermometer 3in1Display: 61mm x 29mm x 17.5mmInstallation dimensions: 58mm x 26mmPower Supply voltage: DC7-30V ( with anti-reverse protection )Display: Four 0.56 "LED digital tubeDisplay Color: YellowRefresh rate: about 300mS / timesOperating temperature: -40 °c - 85 °cMeasuring temperature: -55 to 125°cMinimum input: -55 °cMaximum Input: 125 °cAccuracy: about 0.2 °cOverload: please do not higher than 150 °cSensor Cable Length: 80-100cmSensor probe:18B20,waterproof, accuracy of 0.0625,need not calibrationSome Application: for Measure Car, Room, Water, Refrigerator, Aquarium Temperature And DIY Etc Measuring voltage: Range 0-200VDC , Accuracy 0.1Clock: 24-hour,power off memory function,the battery backup is available 3-4 yearColor: Digital yellow, black shellDisplay modes:only display timeonly display the voltageonly display temperaturetime temperature voltage alternating displayMode setting:Short press to select the clock, seconds, voltage, temperature display mode;Long press show “ALL”, Enter the time temperature voltage alternating display mode,interval of 5 seconds. short press to exit .Time setting:Short press to adjust the hours, minutes (flashing),Short press again to exitWiring of voltage measure:Red: Power Supply +Black: Power Supply -, Measure Voltage -Green: Measure Voltage +Package include:1 x Digital Time/Voltage/Temperature 3 in 1