Plug a microUSB power/data cable into the PyRuler and then into the computer. The PyRuler should be recognized as both a HID Keyboard and a drive.

Once it's recognized by the computer, just press the capacitive touch sensor corresponding to your video conference application to mute the audio and stop the video. Another press should turn it back on once you've finished panicking!

A couple of usage pointers:

• Make sure your video conferencing application is in focus - it's the window that is in the foreground and you're not accidentally hitting hotkeys in other applications. This could have unexpected results!
• Hit the button that corresponds to the application you're using - hitting the wrong button could also have odd consequences.