Connect wirelessly from up to 300 feet away - Bluetooth 4.0 technology makes it easy to link the tracker to your mobile device. Secure the tracker to commonly misplaced items, such as your keys, cell phone, wallet or bag - To make your things easy to find. Ring your things - The app automatically records the last time and place you saw your item with the attached tracker. Find your phone - Double press the Tile button on your device to make your phone ring even when it's on silent. Activate community find - With millions of users all over the globe, the Tile community can help you find your things fast wherever they are. Replaceable battery - Pro uses a replaceable CR2032 battery which runs for a year with no upkeep, and then is easy to replace yourself.