The AirThings Wave Radon air quality monitor. It is a round and white device, with a perforated front.

Airthings Wave Radon

The Airthings Wave, which was later rebranded as the Airthings Wave Radon, measures radon, relative humidity, and temperature. It doesn't have a screen, but informs the user using colour-changing visual alerts.

Changelogs mentioning Airthings Wave Radon