A Bluetooth Tracker is a small device that helps you locate lost items, such as keys, wallets, or bags. It connects to your smartphone via Bluetooth, allowing you to track the item’s location using a dedicated app. When you misplace an item, the app can show its last known location on a map, making it easier to find. These trackers often emit a sound when prompted through the app, helping you locate them by sound. Popular brands include Tile and Apple AirTag, which offer various features like community tracking and replaceable batteries for convenience.