** To ensure environmental accuracy, Radon devices cannot be returned. ** Airthings Wave Plus digital monitor is the first smart IAQ monitor with Radon detection, designed for homes and all populated spaces. It's the perfect solution for homeowners, employers and facility managers to gain full visibility into six indoor air factors; radon, carbon dioxide (CO2), airborne chemicals (TVOCs), humidity, temperature and air pressure. Airthings Wave Plus includes a free app (iOS/Android) and an online dashboard with advanced analytics. Easy to install and monitor.