Low profile, compact horns mount almost anywhere and provide powerful tone for boating safety * Meets ABYC standards for boats up to 16.4 ft. (5 meters) and USCG standards for boats up to 38.4 ft. (12 meters) * A completely sealed sound unit * Features a solid cover, diaphragm, vibration-dampening pad and mounting bracket * Pre wired, for 12-Volt D.C. systems only