Features Include:. Meets 1/1/05 requirements set by RVIA for CO alarms and Propane Detectors. Test/Reset Button w/Mute.. Both alarms are fully operational during mute cycle & will re-alarm if hazardous conditions recur. Both sensors continue to work during an alarm. UL listed for Recreational Vehicles and Unconditioned Areas for both Carbon Monoxide and Propane/Natural Gas. One Year Limited Warranty. UL Listing Propane - UL 1484 RV Gas Detectors. UL Listing Carbon Monoxide UL 2034 RV Carbon Monoxide Alarms. ULC Listing & CSA 6.19-01