The dual compact electric trumpet horn exterior is constructed of a 100% stainless steel with a 304-stainless steel diaphragm. Sealed sound unit achieves a 110 dB(A) rating at one meter. Use the holes in the bracket as a template for the location of the mounting points and wiring. When installed the trumpet should point slightly downward to permit water drainage. 12V DC, pre-wired. Meets ABYC standard A-23, NMMA type accepted #748510, for use on vessels under 39'.