Air Horn, Electric, Length (In.) 5-3/4, Width (In.) 3-1/2, Height (In.) 4-37/64, Material ABS Plastic, Finish Chrome Plated, Single Stud Mounting, Decibels (dB) 123.5, Pressure (PSI) 10 to 12, 16 Amps, Voltage 12VDC, For Use On Cars, Trucks and Vans, Includes Mounting Hardware, 30A Relay