Meets 1/1/05 requirements set by RVIA for new RV's requiring both Propane detectors and CO alarms. Also detects Compressed Natural Gas (CNG)/Methane. Includes 3 amp relay to control solenoid valve to halt gas flow or shut down a generator during an alarm. Interconnect up to 9 alarms. When one unit sounds an alarm all connected units sound the alarm. Test/Reset Button - Tests all detector functions with one touch. Resets and Mutes alarm while safety and corrective actions are taken. Alarm is fully operational during mute cycle and will re-alarm if hazardous conditions reoccur. RV 12 Volt Hard Wired Model. Prevents accidental disconnection during alarm. Built for the extreme RV environment. One Year Limited Warranty. UL listed for Recreational Vehicles and Unconditioned Areas.