Marinco Compact Electric Horns Has a totally sealed sound unit with type 304 stainless steel cover, diaphragm and mounting bracket Maximum amp draw: 3 amps, 12 volt dB(A) rating: 106 at one meter Fundamental frequency: 440 +/- 20Hz Dimensions: 3" L x 3.25" W x 1.75" H 12-volt electric boat horn; comes with vibration-dampening pad Cover, diaphragm, and mounting bracket made of 18/8 stainless steel Compact size enables you to mount it almost anywhere Totally sealed construction for increased durability Measures 3 3/4 inches by 3 inches by 1 3/4 inches; includes one-year warranty