Round voltmeter ammeter, real-time monitoring of vehicle batteries, remind you to charge or replace in time, better to avoid emerging dead batteries when starting the car engine! Built-in 3-bit LED digital display, clearly shows you the current accurate readings of working volts, better helps you notice your car voltage status early. Super large input up to DC 60V with over-current, over-voltage and short circuit protection, well protect the whole circuit, suitable for most 12-24V vehicles, motorcycle, UTV, RV and marine boats. Made of environmentally friendly and flame-retardant plastic and good conductivity pins with matte black treatment, wear-resistant for long service life. Measuring 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. Color: Black Material: PC Package Contents: 2 x Voltage Ammeter Only the above package content, other products are not included.