"A computer expansion card that has been repurposed to act as a key to open a door. The label is blue."
Keycard (Blue) (電子基板 (青) denshi kiban (ao) ) is a key item in Resident Evil 7: Biohazard.
The Keycard (Blue) is meant to be used on the electronically locked door in the Yard.
The Keycard (Blue) is located in the Main House Attic. The Shadow Puzzle needs to be solved to reveal it.