The DEFCON KL is a cable lock for notebooks which is locked using a key, so no need to remember any combination access code. It is a sturdy locking device featuring a steel cable, with a pass through loop on one end, & lock on the other end. Any attempts to remove it, will noticeably damage the computer, preventing resale & therefore discouraging theft. The lock utilizes the security slot already built into your notebook computer, & attaches to the notebook using the same method as the DEFCON CL (Combination Lock). The Key Lock also comes with 2 identical keys, giving you the peace of mind of a back-up key.