Every USB interface is live at once; this picks which one the stick drives. The serial stream runs regardless.
The mic listens continuously once started, but ignores everything until it hears the wake phrase. Say it, then any command below, then the sleep phrase to go back to being ignored.
Recognition runs through the browser's built-in speech service — Chrome and Edge send the audio to Google for transcription, nothing here has a server of its own to send it to.
Writes everything to the board, including the mode you are in now, and comes up that way next time it is plugged in. It applies on any host — including ones this page cannot reach, like an iPad.
Puts every setting back to its built-in default, including the key mapping and the startup mode, which returns to Parked. Nothing is written to the board until you save.