KEEDOX® Mini Green 0.36 " LED Digital Volt Voltage Panel Meter Voltmeter 0-99V, Three-wires
Feature:Dimension: 23x20x11mm (without mounting ears)Power Supply: DC 4.5-30VOperating temperature: -10c~ 65cWiring:Red: Working Power Supply Positive +Black: Common Negative -Yellow: Measure Voltage Postive +Power cannot be reversed, otherwise it will burned the modulePackage Includes:1x Digital Voltmeter