HP SmartCard Dummy with Pen Loop, 942400-001 is a small notebook accessory listed for use with the HP EliteBook x360 1030 G2. Its dummy design provides a matching insert for the smart card area, while the attached loop gives a place to keep a pen with the notebook.
The listing also associates this part with the HP 1030 G2 SmartCard Pen Holder. It is a focused part for that notebook setup, combining the smart card dummy and pen loop in one piece.