Every USB interface is live at once; this picks which one the stick drives. The serial stream runs regardless.
Say left click, right click, middle click, mouse mode, keyboard mode, gamepad mode or park. 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.