Easy Connection to Your Mobile PhoneThis key finder uses Bluetooth 4.0 technology and can connect to Android, iOS, iPad, and other smartphones. Download the free iSearching/Kindelf/issearchingpro app and pair it with your smartphone. You can make the product beep to find your things via the app. Find EverythingSet of 4 black key finders. Our GPS tracker is very useful for finding your items. Up to 6 anti-loss devices can be connected simultaneously. View lost keys, wallets, remotes, glasses, mobile phones, dog collars, or other items far away from you on the APP so you can find them accurately. Just press the button and follow the sound, and you'll never lose your valuables again! Positioning Tracking: You can check the current location of the item on your mobile phone, and you can check the last remaining location after disconnection. Our gadget finds the nearest street where you last placed them and then gives you the signal strength to guide you to your lost items. Two-Way SearchYou can even locate your phone by pressing the product button, and you can double-click the product button to make your phone ring. It sends ringtones to the phone until you find it! Remote SelfieAs a remote shutter for selfies, you can remotely control your smartphone's camera by pressing the search button.