When conditions demand a powerful sound, use the Model 805 roof mounted horn. Every component of the horn is made to withstand the extremes in weather conditions. The mounting base of the Model 805 fastens with four stainless steel bolts which provide a secure watertight installation. The air feeder hose connection has been designed to mount easily and to be hidden from view. Both trumpets are finished in bright chromium triple plated, making the Challenger an attractive addition to any truck. Built with quality components that will give years of dependable service. All needed mounting hardware is included. The Model 805 requires an on board air system. Spanish instructions are included. Challenger Air Horn Specifications: Horn Size: L 13¾ in. x W 8 in. x H 4¾ in. Sound output with 90/100 psi: 125db / 235Hz Operating air pressure: 12-110 psi Horn construction: All metal, base - painted enamel, trumpets - chrome platedHose fitting size: ¼ inchAir fittings are brassMounting hardware: Stainless steel