These Little General Chrome Air Horns offer a BIG sound. Ideal for trucks with limited space, these truck train horns measure 11 1/2"L x 6 1/2"W x 6 3/8"H. 120 decibels! Mounting hardware and solenoid valve included. Requires 5/16" ID hoses. Chrome plated die cast construction. Operating range from 70 PSI to 120 PSI. On-board air system required for these truck train horns.