Digital Voltmeter Features: Universal for: Motorbike Car / Boat / ATV / UTV / Camper / Caravans / Travel Trailer etc. Twist-and-Lock system.Display: 3-bits, LED digital tube, lamp display is optional (Red, White, Blue, Green, Orange) . It works for 5V-48V. Mini size and easy to install,work great for checking Voltage. Mounts in a 1-1/8"hole in panels up, 0.25"thick, a nylon retaining nut holds the meter in place. The state of your battery between full charged and discharged The meter has easy to read LED segments and connect to your 12 volt system. Used to monitor the storage-battery voltage, with reverse connection protection function, line will not be burnt. Timely grasp the state of battery voltage, voltage measurement purposes can also be used for other products. Specifications: Waterproof; Flame retardant material Measure voltage: 5 - 48V Diameter: 36mm / 1.42in Interface Type: Anode and cathode Eco-friendly Material: Plastic Item color: Black Lamp display color: Red, White, Blue, Green, Orange (Optional) Application: Universal for all Cars, motorcycles and other universal models.