Kleinn Air Horns 102 Chrome-Plated Copper Dual Truck Horn has two chrome all metal trumpets 16.75 inches and 14.5 inches in length. Think fire truck or ambulance air horn but louder. The compact air horns can fit in almost any vehicle and deliver the big sound you need. Easy to fit, glistening chrome finish and extreme truck horn sound; this air horn is the complete package. It requires an onboard air system up to 150-PSI for operation (not included). There is a Vortex 4 ?12-volt electronic air horn solenoid included. Too Loud? Too Bad.