A small switch, labeled S4, on a black circuit board.
https://digipres.club/system/media_attachments/files/113/653/526/053/060/816/original/9951b4c310b64c2b.jpg
Also see this little switch here? Turns out it's an unmentioned-by-the-manual reset switch. That'll get it to stop blinking AT LEAST UNTIL YOU PRESS A BUTTON.
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