The Safe-T-Alert RV 40 Series Propane/LP Gas Alarm is designed for the rugged RV environment and is ideal for Class A motor homes, Class B van campers, Class C mini-motor homes, travel trailers, fifth wheels, trucks and folding campers. It features advanced technology with an "Alarm Mute" button that silences the alarm when the RV is ventilated and rapid recovery sensor that resets when silenced or reactivates if dangerous levels of propane remain. Easy 12 Volt installation means there will be no missing or dead batteries to replace. Meets RVIA/NFPA requirements. Listed to UL 1484 RV.