ITEM NAME:Voltmeter Voltage Indicator Panel Meter C9G5 Voltmeter Voltage Indicator Panel Meter C9G5 Display: Three digits You can install these mini voltage display easily. Measuring range: DC 7 - 20V Working current: DC 7 - 120V 20 mA Display color: Blue Color: Blue Dimension: Approx. 48 x 29 x 23 mm Accuracy: 1% Storage temperature: -10 °C + 65 °C Red with positive combine, black with negative.