** To ensure environmental accuracy, Radon devices cannot be returned. ** Airthings View Plus digital monitor offers peace of mind and the best technology available! Monitor and easily track through the app, radon, carbon dioxide, VOC's, humidity, particulate matter, humidity, air pressure and temperature. Customizable display and easy colour coded wave response (red/yellow/green air quality indicators) makes use a breeze! Includes 6 AA batteries for 2 years of continuous use. USB-C connection compatible, Bluetooth compatible, Hub compatible.