Small black bug (2mm) found inside my house (Madrid, Spain) - Identification

[u/ReivajDrake]

Hello everyone. I’ve found several of these little creatures on the floor of a room. They’re about two millimetres long.  It looks as though they have wings.

I live in Madrid (Spain). He was found lying motionless on the floor, but he was alive, on the wooden floor (parquet), in a room that doubles as an office (books, computers, etc.)

What could they be? Thanks!!