Safe-T-Alert 20-441-P-BL RV Mini Propane Leak Detector / Alarm ( LP Gas Sniffer )This is a replacement propane leak detector, sometimes referred to as a “Gas Sniffer”. Typically found mounted low to the floor since LP Gas is heavier than air and will seek the lowest level. When powered with 12V DC, this monitor will detect the presence of gas and sound an alarm to warn the residence of your RV.Additional InfoDimensions3-1/2″W x 2-1/2″H x 1-9/16″DMount StyleSurfacePower Source12V DCColorBlackLifespan5 YearsMoreInstallation Manual