MINI COMPACT ELECTRIC HORN is the most popular compact marine horn worldwide. Inexpensive, totally sealed sound unit. Type 304 stainless steel cover, diaphragm and mounting bracket. One year warranty. 12 volt. Prewired. Exceeds Coast Guard specifications for vessels up to 12 meters. Size is 3 inches H x 3-1/4 inches W x 1-3/4 inches H.