5pcs 2 Wire 0.36"DC 3.2-30V Red LED Digital Panel Meter Voltmeter Voltage Tester Range: DC3.2-30V 2-wire access Display: three 0.36 LED digital tube Accuracy Class: 0.5 %(+/- one word) Refresh rate: about 500ms / times Operating temperature: -10 C ~ 65 C Supply voltage: DC3.2-30V (with measurement of line) Dimensions: 3.1cm * 1.4cm * 1.2cm (L * W * H)