Includes four item trackers Trackers attach easily to your keys, backpack, purse, and anything else you want to keep safe and secure 400-foot Bluetooth range and the companion Tile app ensure you can find your belongings when they've been misplaced Tile's loudest ring alerts you to your item's location and a side button on the tracker lets you find your phone with ease Water-resistant design protects your tracker from unexpected splashes Non-replaceable battery lasts for up to a year for long-lasting use