MPC Truck Horn for Big Rigs Huge 25" Air Horn w/12 Volt Air Solenoid Trumpet Dimensions: 25"L x 7.75"W x 5.5"H DB output: 147.3 db Construction: Chrome plated zinc alloy **PLEASE NOTE: This horn requires a compressor and air tank to operate. The compressor and tank are not included in this listing. For a complete packages that include a compressor and tank, please visit other Amazon listings** **PLEASE NOTE: This horn requires a compressor and air tank to operate. The compressor and tank are not included in this listing. For a complete packages that include a compressor and tank, please visit other Amazon listings**