Space Saving. Compact design Space Saving. Compact designIdeal for Class A Motor homes, Class B Van Campers, Class C Mini-Motor Homes, Travel Trailers, Fifth Wheels, Truck & Folding CampersAlarm Mute button silences alarm while RV is ventilatedRapid recovery sensor resets when silenced or reactivates alarm if dangerous levels of CO remainMemory Scan™. Retains the CO level that activated the alarm12 Volt power means no missing or dead batteries to replaceMeets RVIA/NFPA requirements