Useful tool: The LED display car voltmeter is applied to monitor the voltage of the storage battery and measure other product. Easy to install and grasp the state of battery voltage in time. Wide use: Compatible with motorbike car, boat, ATV, UTV, camper, RV, caravans, SUV, off-road, travel trailer, ship, truck and so on. Specification: Voltage: 12V Measuring range: 5-32V DC Working voltage: 12-24V DC Material: copper, ABS plastic Dimension: approx. 1.43 x 1.43 x 1.18 inches Hole size: 1-1/8 inch, 0.25 in thickness Color: as picture shows Package include: 2 x LED digital car voltmeters Note: The words on the product are not as trademarks, our trademark is BBTO. Since the size above is measured by hand, the size of the actual item you received could be slight different from the size above.