Universal replacement. Replaces All Brands/Models of LP Gas Detectors and Dual CO/LP Gas Alarms. 85 Series models include trim ring that covers large existing installation cutouts. Can be used with or without the trim ring. Double-Duty Alarm. Upgrades single 12 Volt Propane Gas alarms to a dual alarm that detects both Propane Gas and Carbon Monoxide (CO)Low Profile slim designDesigned for the Rugged RV Environment. Ideal for Class A Motorhomes, Class B VanCampers, Class C Mini-Motorhomes, Travel Trailers, Fifth Wheels, Truck & Folding CampersAdvanced Technology. Alarm Mute button silences alarm while RV is ventilated. Rapid recovery sensor resets when silenced or reactivates alarm if dangerous levels of Propane or CO remainReliable. 12 Volt power means no missing or dead batteries to replaceApproved. Meets RVIA/NFPA requirementsConforms to UL 1484 RV and CSA 6.19