From:
http://valentine1.com/lab/MikesLabRpt3.asp
II. How to determine your software version.
Press and immediately release the Control Knob to display software version. The software-version number is four digits that display one digit at a time in the Bogey Counter-example: 2.869.
Note your software number, then see the table below for features that are programmable in your unit.
Press and immediately release the Control Knob to exit software-version display.