Safe-T-Alert 62 Series Carbon Monoxide Alarm with Relay - 12V - 62-541-Marine-RLY-NC - Surface Mount - White - 62-541-MARINE-RLY-NC62 Series Carbon Monoxide Alarm w Relay 12V 62 541 Marine RLY NC Surface Mount White Mini Carbon Monoxide Alarm with a compact space saving design that replaces your CO alarms that are over 5 years old! The 62 541 Marine PLY NC 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 Designed for the harsh marine environment No False