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The Furby source code is public and heavily commented. For example, it turns the microphone off when the motors are running.

Furby was the 1998 version of ChatGPT and tons of people thought it actually slowly learned English words. The NSA was alarmed. However it turned out the "learning" process was just on a timer and the "microphone" only triggers on loud sounds.
https://archive.org/details/furby-source