Round Ammeter Voltmeter, real time monitoring battery packs of vehicles, remind you of charge or replacement in time, better avoid emergent dead battery at starting car engine! Embedded in 3-bit LED digital display, Clearly shows you the current precise readings of working volts, better helps you to early notice your car voltage condition Super large input of up to DC 60V with Over-current, Over-volt and Short Circuit Protection, well protects the whole circuit, fits for most 12-24V Car Motorcycle ATV UTV RV Vehicles and Marine Boat Made of Eco-friendly & flame retardant plastic and good conductivity pins with black matte treatment, wear and tear resistant for long lasting durability Measure voltage: DC 12V-24V Size: 37x37x32mm Interface Type: Anode and cathode LED display color: Red Application: Universal for all Cars, motorcycles and other universal models. Colour:black Material: PC Package Contents: 1 x Voltage ammeter Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.