Digital Car LED Electronic Clock Time Temperature Voltage 3 in 1 Meter 12V 5-20V 28TC Features:1. There are three functions, preset time, temperature and voltage2. The three functions can be switched at any time.3. A total of 4 kinds of display modes.4. Time display only/temperature display only/voltage display only/three functions alternative display (note: in display mode, can choose whether to display 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-5 - 5.6. Backup battery, power off time to continue working. Specifications:Voltage: 5-30V(To use the voltage meter function, input voltage at least 7V above)Voltage meter range: 7 - 20V(Error 0.1V, measuring voltage = input voltage)Temperature measurement range: -50 - 130 °C(Original temperature range from -9 - 60 °C)Current: about 30mAr Measurement: 40mm x 13mm Thickness: 14mm Application: especially suitable for 12V car Note:1. Recommended more than 5.5V power supply, not in line with the standard of power supply, will burn out, need to install power wiring2. Please allow 1-3mm error due to manual measurement. Make sure you don't mind before you bid.3. The colors may have different depending on the difference displayed, please understand. Package Included:1 x Digital Car Clock Time+Temperature+Voltage 3in1 Meter