Feature:1. High Accuracy Measurement: Ultra low cost, high accuracy meets most application requirements.2. Reverse Connection Protection: The power supply has reverse connection protection, and the reverse connection line will not burn.3. 3 Wire DC Digital Display Voltmeter Head: The measuring range is 0V99.9V, and the power supply range is DC 530V.4. High Brightness LED Display: The display devices all use high brightness LED digital tubes, and the display effect is good.5. High Quality: It is manufactured by fully automatic SMD technology with superb craftsmanship.Specification:Item Type: Digital Display VoltmeterMaterial: PCBSize: Approx. 48 x 30mm / 1.9 x 1.2inPurpose: DIY ModuleMeasuring Range: DC 0V-99.9VPower Supply Range: DC 5-30V (External Power Supply is Required)Maximum Input: DC 30.0VAllowable Error: 1%; When Greater Than or Equal to 10V, The Error is 0.3V; When Less Than 10V, The Error is 0.10Display Mode: Three Digit 0.56in LED Digital tTubeWiring: 3 wires, 20cm / 7.9in in length, the black wire is the shared negative pole; the red wire is the positive pole of the power supply voltage (DC 5~30V); the white wire is the positive pole of the measured voltage (DC0~100V)Working Temperature: -10~65.Package List:2 x ModuleNote:If the input voltage is higher than 30V, it may be permanently damaged!