The HP 922749-BA1 is a backlit keyboard for the HP Elite x2 1012 G2 Tablet with Collaboration Keyboard. It is the Slovenia-use keyboard part identified in HP’s service guide, intended for typing with this tablet.
The keyboard is detachable: HP’s guide explains that it can be pulled away from the computer. This makes it possible to remove the keyboard from the tablet when needed.
This part is specifically identified by the suffix BA1 for use in Slovenia; the service guide lists other regional keyboard versions separately.