With LED digital display design, this voltmeter has high-definition and high measurement accuracy. It has low power consumption, good stability and safe and reliable use. There are two wires in this voltmeter to monitor and measure the voltage. Moreover, it has the reverse connection protection function, so the reverse connection of the wires will not be burnt out. It is constructed of metal, abs material. The length of this product is 20cm. It is suitable for household, industry, workshop, engineering, etc. Item Name: Voltmeter Material: Metal, ABS Features: Low Power Consumption, Reverse Connection Protection, Not Burn Measurement Range: DC 4-100V Refresh Speed: About 300MS/Time Operating Temperature: -30-65 Degrees Celsius Size Details: Length: 20cm/7.87"(Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Voltmeter Have a great time shopping!