HP LaserJet 4345 Multifunction Printer series - Manual (Page 159)

Locking the formatter cage
You can place a Kensington lock on the formatter cage to prevent unauthorized access to
components on the formatter.
Note A Kensington lock is typically used for locking laptop computers to prevent theft.
The following figure indicates where you should place the lock.
ENWW Locking the formatter cage 145