MPC Train Air Horn Kit; Three Oversize Trumpets, 12-Volt w/150 PSI Compressor & Tank Fullsized Chrome Triple Air Horn (Dimensions: 16"L x 13.75"W x 11.5"H) w/ 12v Electronic Solenoid 150 PSI Sealed Compressor w/ Remote Intake (Dimensions: 6.5" x 3.5" x 4.5") 1 Gallon Steel Air Tank (Dimensions: 11" x 6.5" x 6.75") Kit includes a pressure switch (110 PSI on/145 PSI off), 12 ft of 1/4" air line, push button switch, all necessary tank fittings and mounting hardware Free Wiring Kit!