LED Digital Volt Voltage Panel Meter Voltmeter 4.0-30V 0.56" (Green) Dimensions: 48 x 29 x 21mm Cutting Size: 45.5x26.5mm Measure range: DC4.0-30V (Do not need Power Supply, Measure 4.0-30V directly ) Permissible Error: 1% (+ / - 1 Digit) 1 X LED Digital Volt Voltage Panel Meter Voltmeter 4.0-30V 0.56" (Green)