DROK Digital LCD Display AC Voltmeter Gauge AC 0-199.9V Volt Panel Meter 3 Digits Voltage Tester Monitor Operating voltage: AC/DC 8-12V; Operating current: &lt; 15mA. Standard size: dimension: 794325mm; cutting size : 76 x 39 mm, easy to install. Good stability, high measurement accuracy, good anti-jamming capability. When over range, the first digit of the AC voltmeter will display 1 or -1. Display: LCD, blue backlight, character height 20mm.