The Marinco (formerly AFI) compact 12 volt boat horns are sealed with a stainless steel top cover on a plastic base. They come pre-wired mounted to a stainless steel bracket which can be fixed to your boat with the two fixing holes. These boat horns are designed and manufactured for the marine environment. Sealed together with water resistant seals and internal vibration padding, the classically designed horn top cover allows rain to run off and prevent water build up. Type 304 stainless steel covers, diaphragms, and mounting bracket. Specification: Voltage: 12v Width: 198mm Depth: 85mm Height: 62mm Base Width: 25mm Base Depth: 50mm Fixing Hole Centres: 25mm Maximum amp draw: 6 Amps dB(A) rating: 109 at one metre Fundamental frequency: 490 20/440 20 Original Sealine supplied OEM part.