BETOOLL HW3036 Chrome 12V Dual Trumpet Air Horn Compressor Kit Train Car Truck Boat Super Loud Construction: Chrome plated zinc alloy Voltage 12V DB output: 150.2 db Dual Trumpet SUPER-LOUD Air Horns Provides a Powerfully Loud Freight Train Sound Works on any 12 Volt Vehicle including Cars, Trucks, Vans, Motorcycles, Buses, and Boats