A small PCB with a connector on one end. It's labelled DIGIFLEX Default Unlock Key. A small micro and maybe an EEPROM? are visible. It has finger cutouts labelled HOLD HERE. Two LEDs are on the user side of the board, labelled "Good" and "Used"
https://digipres.club/system/media_attachments/files/115/160/920/904/106/241/original/071587f412bd4d6e.png