It is hooked up to the electrical system of the rv. Keep your rv adventures safe with the vitite rv carbon monoxide & propane detector That way it’s easier to tell if there is an rv propane leak
Guide to the Best RV Propane Leak Detectors for 2023 - Nerd Techy
Because propane gas is heavier than air, rv manufacturers install a propane detector close to the floor of the rv, to hopefully sound the alarm if there is a propane leak so you can evacuate (and turn the propane valve off).
