[Real Time Voltage Reading]:digital voltage meter could give a real time voltage reading of your batteries. You will never have to risk being stranded from your batteries going dead; [Wide Voltage Range]: The volt meter display range is DC 15-120V, accept input voltage range of electric cart 12, 24, 36,48 or 72 volt , it can fully adapt to it. There is no need to worry about high voltage will be burned, or low voltage Normal measurement; [High Quality,Water-Proof and Shock-Proof]:This voltmeter uses a fully enclosed enclosure, a potted and fully waterproof design.Long-term immersion in water can still work normally without damage, and it is more resistant to moisture, oil, and vibration?? [Easy to Mount, Only two Connection Wirings]: Connect + to + and – to -. If you want to connect it through a key switch then connect + to switch, switch to battery +, and – to -(pls refer to diagram in our ads); [Package Includes]:1x Waterproof Digital Display Voltmeter. One year warran