Never lose your keys, purse, briefcase, or other important items again with the First Alert Lost Item Finder. Attach the Finder to your belongings with the easy-on clip, download the FREE "Find Stuff" app to your iPhone, iPod or iPad (iOS device) and use Bluetooth 4.0 technology to locate your item. When the Finder is out of range the app will inform you that you"re far away. When the Finder is within range (33 feet ) of your iOS device, it alerts you to the proximity of what you"re looking for with a beeping sound. This compact and durable gadget has a water proof rating of IPX4, meaning it can handle being splashed by water. Be prepared and ease the search when you lose something with the First Alert Lost Item Finder.