SMAKN&reg; Waterproof Monitor Three Wires Dc 0-100v 12/24v/36v/72v/96v Volt Battery Meter Voltage Tester Automative Electric Cars Gauge Small Digital Voltmeter BLUE 0.52" LED Display Measure Range:DC 0-100V Power Supply:DC 3.3-30V With Reverse polarity protection Three LED display and Three wires Display Color:BLUE