SMAKN&reg; 2 Wire BLUE Dc 4.5-150v LED Panel Digital Display Voltage Meter Voltmeter Measuring range:DC 4.5-150V (two wires access) Current consumption: 5-15mA(generally), less than 20mA Display: three 0.56" LED digital tube Display color: red Allowable error:1% (+/- 1 digit)