Drop-In Hidden Horn V.3 with Grills 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 and ABYC standard A-23 for use on vessels under 12m (39&';). 12VDC. NMMA Type Accepted #2577066.WARNING: This product can expose you to chemicals which are known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to P65Warnings.ca.gov. Specifications: Voltage - Input Range (Volts): 12v Box Dimensions: 2"H x 9"W x 15"L WT: 0.85 lbs UPC: 035514432078 .embed-container { position: relative; padding-bottom: 56.25%; height: 0; overflow: hidden; max-width: 100%; } .embed-container iframe, .embed-container object, .embed-container embed { position: absolute; top: 0; left: 0; width: 100%; height: 100%; }