Dual Trumpet Chrome Brass Air Boat Horn Kit with Compressor AFIs Dual Trumpet Chrome Brass Air Boat Horn Kit with Compressor looks good on any boat. This air marine horn meets ABYC and NMMA regulations on boats up to 66 feet in length. Produces sound levels ranging from between 120 and 127 dB. Runs on 12V Product Features 12 Volts Sounds level range 120-127 dB ABYCNMMA regulations met on vessels 66 feet and under dB Rating 121 at one meter 13 octave band Click here to download AFI Dual Trumpet