Keypad

Keypads are button based mechanisms in both System Shock and System Shock 2 that regulate entry through the doors that they control. They need the code to open them or they can be hacked (in System Shock 2).

System Shock
They are encountered by the Hacker on the Citadel Station on Levels R-6.

System Shock 2
They are encountered by soldier on Earth and the Von Braun (except Hydroponics) and are manufactured by TetraCorp.