The Door Angel - Anti-Bumping Deadbolt Safety Door Security Lock PROTECTS AGAINST KEY BUMPING - The Door Angel is especially designed to deter unwanted entry into your home by people with keys or intruders using the Key-Bumping method. EASY TO USE - Easily attaches to most deadbolt locks, quickly and effortlessly and INSTALLS WITHOUT ANY TOOLS! QUALITY CONSTRUCTION - Made from high grade materials, the durable frame can withstand almost anything you can throw at it. KEEPS THEM OUT - Keeps Out Any one with a key, without changing locks: Land Lord, Ex Husband / Wife, Old Roomates, Maintenance People GREAT FOR - Seniors, Women, Handicapped individuals, Families, College students, Travelers