Professionals who can pick locks and circumvent alarm systems commit a very small portion of burglaries. Most criminals enter homes by opening unlocked doors or windows; lifting sliding glass doors off their tracks; prying open weakly defended doors, windows, and garages; or using unauthorized keys. Intruders prefer visual obscurity, silence, easy entry, and quick exits. Your primary objective when planning home security, then, is to beef up your locks and latches, and maintain good security habits. We details ways to improve your home's physical barriers in the next article. Burglaries are major sources of guns for criminals, although estimates of the percentage of crimes involving stolen guns vary widely. Each year more than 100,000 guns are reported stolen—but no one knows how many more gun thefts are unreported some studies estimate over 60 percent. Trigger locks can prevent accidental shootings but not thefts. If you have guns, store them in locked gun boxes or on gun racks that cannot be easily removed. Another option is to use a Simplex lock, which is a small gun safe opened by pressing five buttons in a specific order, a process that can be done quickly even in the dark. Steel gun boxes with Simplex locks usually cost $150 and up.