12V Drop-In Low Profile Horn with Black - White Grills 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. The latest addition is the "H" Horn Phase II, which is the loudest drop-in horn available today. Features: - Comes with both white ASA and black ABS screw-in grills - Grills have water resistant fabric liners - Easy installation: 2.75" diameter hole x 1" deep - 12 Volt, maximum amp draw: 4 Amps - New louder dB(A) rating: 111 dB at one meter - Fundamental frequency: 360 +/- 20Hz - Mounts from the outside, grill screws on for easy install - Easy retrofit