ITEM NAME:2 Wire Blue DC 4.5-30V LED Panel digital display Voltage Meter Voltmeter E8R7 2 Wire Blue DC 4.5-30V LED Panel digital display Voltage Meter Voltmeter E8R7 Product Features Measuring Range: DC4.0-30V. Minimum input: DC4.5(Below this voltage,it will show measurement inaccurate, or don't show). Maximum Input: DC30V(please do not exceed 30V, otherwise, the meter would be damaged.). Refresh speed: about 500ms/each time. Size:4.8cm x 3cm x 2.2cm - 1.89inch x 1.18inch x 0.87inch. Brand new and high quality. Display: three 0.56LED digital tube. Power supply:No need power supply. Current consumption: Less than 20 mA, general 5-15 mA. Working temperature: -10 ~ 65. Material: plastic + LCD Package Included: 1 x DC 4.5-30V LED Voltmeter NO Retail Box.Packed Safely in Bubble Bag. Note:Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.