Color: Black

Current:≤4A

Voltage: 12V/24V

Frequency:450hz

Sound level:≥120db

Air Horn trumpet quantity:4

Train air horn caliber:90mm/3.5in

Truck air hor length:approx 6.3";8.9";11.3";13.5"

Air horn 4 trumpet kit includes basic mounting hardware,easy to install

Four trumpet air horn blares are very loud and can be great bellowing sound catches everyone's attention

Quad trumpet train air horn fit for car,vehicle,truck,yacht,boat,SUV.ect Please note: Onboard air system (air tank & compressor) required to operate- not included Mounting angle downward,so that moisture can not collect in the horn If no sound or strange sound,check the horn wire (+/-). Connect the grounding cable to avoid spark Disconnect the ground cable first remove Be careful not to put too close to the chassis of the horn trumpet rattling noise reduction. No Installation Instructions Included, professional installation is recommend Package 1 x Four Trumpet Truck Train Air Horn with Mounting Screws and Wiring