Check your Smoke and Carbon Monoxide Detectors every First of the month, to make sure they work. Change your batteries in all Smoke and Carbon Monoxide Detectors every 6 months. Fire Departments are recommending that you do. Many places that catch fire either do not have working smoke detectors or do not have the period. Carbon Monoxide is an odorless, colorless gas that can kill. These are must items to have in your house or an apartment. These will save your or your family's lives. If you can not afford them. Contact your Local Fire Department to see if they can help you. Check your Smoke and Carbon Monoxide Detectors every First of the month, to make sure they work. Change your batteries in all Smoke and Carbon Monoxide Detectors every 6 months. Fire Departments are recommending that you do. Many places that catch fire either do not have working smoke detectors or do not have the period. Carbon Monoxide is an odorless, colorless gas that can kill. These are must items to have in your house or an apartment. These will save your or your family's lives. If you can not afford them. Contact your Local Fire Department to see if they can help you.