Dual Trumpet Horn, Air, Length 13 5/8 In., Width 6 1/2 In., Height 3 1/4 In., Material Plastic and Steel, Finish Chrome, Roof Mounting, Decibels 120 dB, Voltage 12 DC, For Use On Trucks, RVs, And Vans, Includes Heavy-Duty Direct Drive Compressor, Relay, Hose, and Mounting Hardware