Combo Carbon Monoxide Propane Alarm - White. Test and inspect the Propane and CO alarms installed in your RV every week and replace malfunctioning alarms. Replace all Propane and CO alarms that are 5 years old or older. Install alarms listed for RV use. Prevent accidents by teaching family and friends about the operation of the alarms. Never ignore a sounding alarm. Features Double-duty alarm - Detects both gas leaks and CO gas simultaneously Reliable - 12V power means no missing or dead batteries to replace Durable - Built for the extreme RV environment End of Life Signal Specifications Color: White Weight: 0.4 lbs