Key finders are small electronic devices designed to help people locate misplaced items, such as keys, wallets, or phones. They typically connect to a smartphone app via Bluetooth, allowing users to track the location of their belongings. When an item is lost, the app can help pinpoint its last known location or make the key finder emit a sound to aid in the search. These devices come in various shapes and sizes, often resembling keychains or tags. Some key finders also offer additional features, such as a built-in camera shutter or the ability to find a lost phone by making it ring, enhancing their utility for everyday use.