Marinco is the leading supplier of horns to the marine industry, with over fifty years of experience in designing and manufacturing sound devices specifically for use in harsh marine environments. Stainless steel is used for all critical components such as trumpets, motor cover, diaphragms, assembly and mounting hardware. dB(A) rating: 107 at one meter Fundamental frequency: 370 +/- 20Hz Internal space requirements: 2″ H x 3.375″ W x 3.25″ D Distinctive marine horn sound Enclosed solid unit Easy installation or retrofit, mounts from the outside 12 volt, maximum amp draw: 4 amps Grill must be ordered separately