SeaDog 431250 Drop In 4 Amp 111 DB Horn V.3 with Grills Powder Coated Steel & Injected Molded Nylon.

SeaDog 431250 Drop In 4 Amp 111 DB Horn V.3 with Grills Powder Coated Steel & Injected Molded Nylon. Drop-In Hidden Horn V.3 with Grills is constructed of powder coated steel and injection molded nylon. Kit includes horn plus one chrome and one white decorative billet screw-in grill. Hole size 2-3/4 diameter. At 111 decibels and a frequency (Hz) of 370±20A, this horn meets US Coast Guard's COLREGS