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Features It's brand new, good quality & high performance; Blue LED Digital Volt mini Panel Meter; Doesn't Require a additional working Power; It only have two wires, you can connect to the measure power directlyIt have the polarity reverse protection, won't damage the meter; Specifications Measure range:4.2-30V Maximum input: DC 30V Dimensions: 35 x 23 x 20mm Cutting Size: 33x23mm Permissible Error: 1% (+ / - 1 digit) Display: three 0.36" LED digital tube Refresh rate: Approx. 500mS Current consumption: about 5-20mA Operating temperature:-10 °C ~ 65 °C Wire length:150mm With Reverse polarity protection