Specification:It is easy to read, install and use.And it is self-powered version and supports reverse polarity protection.When the voltage is under 10V, there will 2 readings after decimal point,which mean the accuracy is 0.01 when it is under 10V. When it is above 10V, the accuracy is 0.1.No power supply needed, convenient to use.Type: Digital VoltmeterRed: DC4.50-30.0V, Green: DC4.70-30.0V, Blue: DC5.00-30.0VDisplay: LED Digital DisplayHighest Input: DC 30V (Higher than 30v, it has the risk of burn up.)Minimum Resolution: 0.01V(10V)Resolution: 1% 1DigitCurrent Consumption: Shell Color: BlackOperating Temperature: -20 to 65 Size (L x W x H): 48mm x 29mm x 22mm/1.89" x 1.14" x 0.87" (Approx.)Notes:Due to the light and screen setting difference, the item& 39;s color may be slightly different from the pictures.Please allow slight dimension difference due to different manual measurement.Package Includes:1 x Digital Voltmeter