"The level of this card is "B"."
Key Card Lv. B is a key item in Dino Crisis.
The Ibis Island facility has three security levels - 'A'; 'B' and 'C'. Obtaining the 'B' card can be completely skipped, since there are no level 'B' areas to access, and the 'A' card is found soon after.
The card's purpose in-game is to provide a quicker means of reaching level B3 from B2 via the elevator before getting the 'A' card.
On one of the computers on the lower level, inside the Third Energy Control Room.