What is the MODE button?

The MODE button is used for three main functions:

1. press the "Mode" button once for checking how many days the monitor has measured Radon since the last time it was turned on/reset;
2. press the "Mode" button twice for gathering the 4-digit code you need in order to generate a report.
3. use the "Mode" button to turn off the screen: you can follow the complete procedure here.