The MTI Industries Mini Dual LP/CO Alarm is a flush mount alarm that provides reliable protection against both carbon monoxide and propane gas. This alarm is easy to install and features: Upgrades single 12 Volt Propane Gas alarms to a dual alarm that detects both Propane Gas and CO Flush mount design Test/reset button 12 Volt power means no missing or dead batteries to replace Alarm Mute button silences alarm while RV is ventilated Meets RVIA/NFPA requirements - listed to UL 1484 RV and UL 2034 RV Black finish