Glow is a simple plug-in system that tracks the quality of the air you breathe. It checks the surrounding air for Chemicals (VOCs), CO2 as well as Humidity level and temperature. The Glow smart app monitors the air and provides you with tips and actionable ways to make the air better. And by plugging your fan or humidifier to Glow, it turns them into a smart device that can be controlled by your phone or turn it on automatically when the air quality drops. An integrated nightlight on Glow activates automatically by a motion sensor, by touch or through the app.