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Generally we face a lot of difficulties when we loose any key unknowingly. In order to get rid of such problems invention of key finders took place. As per history, in first generation, key finders were sound based.These key finders are small electronic devices which are used to recover misplaced or lost key sets. It is also otherwise known as key finders or key locators. Their goal is to reduce the time it takes to locate keys or other personal items.