This voltage meter is provided with reverse polarity protection, which means that it will not be burnt when connected reversely.;There are only 3 wires and the meter is small, easy to install.;Wiring: Red VCC : Power supply + (DC 3.5-30V); Black GND: Power supply -, Measurement signal -; Yellow VIN : Measurement signal +;The voltmeter can be used for measuring the car/ battery car/ motorcycle battery voltage, and other forms of voltage.;Note: The meter should be supplied electricity independently, and the power supply range is DC 3.5-30V

• DEOK 0.36 4-digit Red LED Display Digital Voltmeter 0-33V DC Voltage Measure Panel Gauges

DEOK 0.36 4-digit Red LED Display Digital Voltmeter 0-33V DC Voltage Measure Panel GaugesDEOK