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Product DescriptionMarinco's Drop-In "H" Hidden Horn is supplied with both a white ASA and black ABS snap-in grills. This enclosed sound unit offers a distinctive marine horn sound. The 12V horn mounts from the outside, and the grill snaps on for easy installation. Internal space requirements: 2"H x 3.375"W x 3.25"D. 12V with a 4-amp maximum draw. dB(A) rating: 107 at one meter. Fundamental frequency: 370±20Hz.