Specifications: Measuring range: red DC4.50-30.0V, green DC 4.70-30.0V, blue DC5.00-30.0V Power supply range: no need to supply power separately, directly use the measured voltage as the power supply, the scope is the same as above. The highest input is DC30.0V. (Note: The input voltage is higher than 30V and may be permanently damaged!) The tolerance is &plusmn;1%. The error is &plusmn;0.3V when it is greater than or equal to 10V, and the error is &plusmn;0.10 when it is less than 10V. Type: Digital Voltmeter Input Impedance: >100Kohms Operating Current: Red< 23mA, Green< 18mA, Blue< 13mA Refresh Rate: about 300mS/Times Display Mode: Three "0.56" LED Digital Tube Display Color: Red, Green, Blue Working Temperature: -20&deg; C - 65&deg; C Lead Length: 20cm/7.87" (Approx.) Size: 48mm x 29mm x 22mm/1.89" x 1.14" x 0.87" (Approx.) Notes: Due to the light and screen setting difference, the items color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Digital Voltmeter