Combines two key safety devices into one! Compact, flush mount alarm uses the latest microprocessor technology to sense potentially dangerous levels of propane, carbon monoxide and methane gases and sounds a loud 85 dB alarm to keep your family safe in your RV. Memory feature âremembersâ the amount of carbon monoxide that activated it. Red and green indicator lights tell you when all is well or when a problem is detected. Includes 12-volt relay that closes the gas solenoid valve included in the kit. Mfr. 1 year limited warranty. | Safe-T-Alert Carbon Monoxide/Propane Alarm, White