Master Lock brand computer / laptop lock. Apparently laptops have some port in the side that this inserts into. The loop on the opposite end can be put around something. Once secured, no one can disappear your laptop. Great for college. You can set the combination to any of your favorite 4-letter words, like LOAF or TOTS or DRAT, of course. Instructions included. Excellent condition. $5. Cash or venmo. Check out my other listings!