The item locator supports iOS/Android 4.3 or higher (requires Bluetooth 5.0). 1) Please download the "iSearching" app from the app store, or scan the QR code in the manual. 2) Press the button for 3 seconds; the finder will turn on after you hear 3 beeps, and the indicator will flash for 10 seconds. 3) Use your phone's Bluetooth to connect to the tracker. 4) Press the button for 3 seconds and hear a long beep. The smart key tracker is a great gadget to alert you when you're about to forget your belongings. Your phone and the key finder will both ring to alert you once disconnected. Your phone will alarm when the phone is missing by double-pressing the button on the tracker, or you can check the location on the card or by clicking the alarm on the app after missing the anti-loss device. The main tracking device is powered with a superb long standby time of 6 months and can be easily replaced for long-term use. One-time purchase for lifetime use with no monthly fees. The key finder is a great anti-lost alarm reminder to help you search for and locate items you've always misplaced. You can attach your phones, keys, bags, umbrellas, pets, dogs, cats, wallets, purses, luggage, dog and cat collars, and other important items to the finder, making it convenient for you to find them quickly and easily. Great gift choice with the portable carabiner: the key finder is designed in a compact, lightweight size and comes with a portable round carabiner. You can carry it anywhere without the bulk, or attach it to anything you need an item tracker for, bringing convenience wherever and whenever you are.