I lost one cat for 10 days - after that I put locators on all of my three cats. Although it can be removed - it still takes the temporary worry out of trying to find a cat when they decide not to appear when you want them. One person I know had problem finding her cat - it was shut in a garage behind their house. If she had a loc8tor - it would have saved hours of worry and time. They are well worth having. Thanks!