Safe-T-Alert 62 Series Carbon Monoxide Alarm w/Relay - 12V - 62-541-R-Marine - Surface Mount - Black [62-541-R-MARINE-BL]62 Series Carbon Monoxide Alarm w Relay 12V 62 541 R Marine Surface Mount Black Mini Carbon Monoxide Alarm with a compact space saving design that replaces your CO alarms that are over 5 years old! The 62 542 R Marine includes a normally closed relay. Used to turn on exhaust fans, remotes, horns, lights, signals or connect to alarm systems. Features: Space Saving Compact design for boats Surface Mount Designed for the harsh marine environment No False