United Pacific-Black 3 Trumpet Train Horn (UP46172) with Heavy Duty Air Compressor and 5.5 Liter Air Tank  - Tank Details: Tank Size: 18 Inch Length x 5 Inch Width x 5 3/4 Inch Height - Tank Capacity: 5 1/2 Liters - Fitting Type: 1/4 Inch Air Hose - Compressor Details - Compressor Size: 6 Inch Length  x  3 1/2 Inch Width x  5 Inch Height - Voltage: 12 Volts - Current: 12 Ampere - Compressor Auto-On: 80 psi - Off 110 psi - Train Horn Details: - Sound Output: 145db ( 10db) - 12V Heavy Duty Electric Solenoid Included - 150 PSI Max - Dimensions: 15 3/4 Inch Length x 12 1/2 Inch Width x 11 1/2 Inch Height - Sold As Kit