It listens locally for its wake word and sends nothing onward until it hears it. What comes after may be stored, and in some cases reviewed by a person.
The drawing that proves the sentence above. It is the same card that is in the book.
Think of it as
an ear that hears everything but writes down only its own name.
For example
You say its name and a light comes on. Until you said the name, it was not sending anything anywhere.
This is one card out of 275.
The hundred words you meet most are free — the whole set, animated, in one file that works with no internet.
Volume 1 has all 275 in fifteen chapters, with Staying Safe the largest chapter on purpose.