DROK DC 0-300V/0-10A Digital Ammeter Voltmeter Dual LED Display VA Volt Ampmeter Gauge, Build-in Shunt Power Supply: DC 4.5-30V Measure Voltage: DC 0-300V Measure Current: 0-10A forward current (build-in shunt, can measure directly ) Display: 0.28" LED, Dual Color, Red and Blue Operating Current: &lt; 20mA; with reverse polarity protection