DROK LED Digital Voltmeter 0.56'' Micro DC 0-33V 12V/24V Voltage Meter Gauge Panel 4 Digits 3 Wires Volt Tester Power Monitor with White Digital Display for Car Vehicle Motorcycle Battery Monitoring Super -small size(612918mm), wide measuring range: DC0-33V,easy and convenient to use. With reverse polarity protection to avoid burning and it will display "0" when over-range. Comes with two regulator chips, stable operation; wide input voltage: 7-30V. With software filtering function; display with stability and high-definition. Great for monitoring automobile,car battery,motorcycle;allows you to grasp the battery power timely.