(1) Double Air Horn Kit.
Includes 2 Trumpets, air hose, a relay, mounting hardware and a high performance compressor with a built-in air filter. Hella Dual Tone Air Horn Kit. 12V, 240W, The output of the Dual Tone Air Horn system is 118db at 6'. The Large horn tone is 795 Hz tone and the small horn is 840 Hz tone. Air horns should be mounted pointed forward and slightly down so that no water builds up in them.