The HP 840952-001 fingerprint reader module is a board for a laptop fingerprint reader. It is listed for selected HP notebook configurations, including HP 15 G3 and HP ZB15SG3 models.
The same part number is also listed for HP ZBook Studio G3 and HP ZBook Studio G4 Mobile Workstations. The part is identified as a fingerprint reader board, making it a specific replacement component for these listed systems rather than a standalone reader.