Description: Display the DC voltage and current simultaneously by LED digital tube. With reversed-connection protection to avoid burning when connected reversely.but the max power supply can not exceed DC 30V . Timely grasp the state of battery voltage, voltage measurement purposes can also be used for other products shows you the voltage readings and helps you to better monitor car voltage condition. Say Goodbye to Exhausted Battery Before Each Drive!Features: Universally fits most DC 12-24V Vehicles, Cars, SUVs, Motorcycles, Bikes, Boats, Marine, etc. Easy to install,LED display, easy to read. Built in over current, over voltage and short circuit protection, it well protects the whole circuit. While made of flame retardant PC shell and good conductivity connecting pins, it is super sturdy and lasts for a long long time.Specifications: Condition: 100% Brand New Material: PC Color: Black Display: LED Digital Display LED Color: Red / Green / Blue (Optional) Input Voltage: 12-24V DC Ammeter Measuring Range: DC 0.1A-10A Size: Approx. 3.7 x 3.7 x 3.2 cm Hole Size: Approx. 2.7cm round Fit: 12V-24V Car Motorcycle Boat Marine ATV RV VehiclesPackage Included: 1 x LED Digital Round Current VoltmeterNote:1.The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightne of your monitor and light brightne.2.Please allow slight manual measurement deviation for the data.