The Seek 2-Way Tracker features bluetooth 4.0 technology. Simply attach the Seek Tracker to your keys, luggage, or purse, download the Seek app and pair the tracker to your handheld device. The Seek Tracker alerts you when you are leaving important items behind. Never lose your keys or phone again with “One-Touch find” using Two-Way technology, locate a seek device from your phone or locate your phone from triggering an alert from the Seek. The Seek can connect from up to 120 feet away and you can pair multiple Seek Trackers simultaneously. Never misplace or forget your important belongings again with the Seek 2-Way Tracker!