Feature:Display Color: Red, Yellow, BlueThe black line connected to the public negative electrode, red line connected to positive pole of power supply, yellow line connected to positive pole of tested power supplyMaterial: Plastic ShellDisplay Digit: 3Measuring Range: DC 0-30V
Working voltage: 4-30VDisplay Size: Approx 2.3cm x 1.2cm / 0.91″ x 0.47″Overall Dimension: Approx 3.4cm x 2.2cm x 2cm / 1.34″ x 0.87″ x 0.79″ (L x W x H)Cable Length: Approx 20cm / 7.87″Package Included:1 x Digital LED Display Voltmeter