If you might want to see behind a door before you open it use The Under-Door Remote Viewing Kit with a camera that can be slid under a door.
Under Door Remote Viewing Kit
See into a room before opening the door! The Under Door Scope slides under doors in less than a quarter of an inch of space. You can pivot its offset 55° field of view to observe the whole room from the floor up. The Under Door Scope features a dedicated C-Mount for video camera attachment and an attachable viewing eyepiece for visual observations. The kit also includes a Right Angle Viewing Adapter that attaches to the front of the Under Door Scope, showing you a clear view of the inside surface of the door and any barricades or booby traps that may be present.
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