SMAKN 3 Digits 0.56" 3 Wire Dc 0-100v Blue Led Digital Voltmeter Voltage Display Module with Reverse Protection Range: DC 0-99.9V (need extra Power Supply DC 3-30V Power Supply: DC 3-30V Display: three 0.56" LED digital tube Measuring accuracy: 1% (+ / - 1 digit) Display color:BLUE