Protect your RV from the dangers of carbon monoxide and propane gas. Alarm uses the lastest in advanced electrochemical CO sensors to detect carbon monoxide. Assembled in USA. ETL conforms to UL 1484 & 2034 for RV useIncreased RV battery lifeSurface MountedLow ProfileExtensive RV OEM UsageUniversal mounting brackets allow replacement of almost all detectors on the market