Double-duty alarmDetects both gas leaks and CO gas simultaneouslyUpgrades single 12 volt propane gas alarms to a dual alarm that detects both propane gas and CORV carbon monoxide and propane gas alarm has a space saving, compact designReliable 12 volt power means no missing or dead batteries to replaceBuilt for the extreme RV environmentMeets RVIA/NFPA requirementsListed to UL 1484 RV and UL 2034 RVFully operational during mute cycle and will re-alarm if hazardous conditions recur This product ships in approximately 1 days