Iglobalbuy 135DB Single Trumpet 16.9 inch Air Horn Compressor Kit For Car 12V Vehicle Truck Brand New; Super Loud, Twin Tone Sound. Truck Air Horn Single Trumpet 135db;Voltage12V Material: Glistening Chrome Plated ZINC Trumpets (Non-Rusting) Trumpet Diameter: 3.7inch;Trumpet Length: 16.9 inch Mounting Hardware: Included;Easy to install .