Easy to Use: The item locator support iOS/ Android 4.3 system or higher (require Bluetooth 5.0).1) pls download the App "iSearching" from the App store, or scan the QR code with in the manual, 2) Press the button for 3 seconds, the finder will turn on after hearing 3 beeps and the indicator will flash10 seconds,3)Use phone's bluetooth to connect the tracker;4)Press button with 3 sec and hearing a long beep, the device turn off.For Android Phone, ple open the GPS app first before connection. Two-Way Anti-lost Tracker:The smart key tracker is a great gadget to alert you when you are about to forget your belongings. your phone and key finder will both ring to alert you once disconnected,Your phone would alarm when the phone missing by double pressing the tracker's button,or you can check the map location or clicking the alarm on the App after missing the anti-loss device,the finder will sound,too; One phone can link to several trackers. Long Using Life & No Mothly Fee:The key tracking device is powered with super long standby time over 6 months and can be replaced easily for long-term use. Delicate and elegant appearance makes it look like an art of pieces. One time purchase for lifetime use without any monthly fee. Widely to Use: The key item locator is a great anti-lost alarm reminder to help you search and locate items you always misplaced, you can hang on the finder toyour phones, keys, bags, umbrellas, pets, dogs,cats, wallets, purses, luggage,dog&cat pet collar and other important items, convenient for you to find them quickly and easily, bringing a lot of convenience and help you avoid any losses to your life; The tracking range is about 90 feet. Great Gift Choice:The key finder is designed in a lightweight compact size and coming with a portable round carabiner, you carry it to any place without any bulks ,or can put it or hang it to any stuff you needed as a item tracker, bringing convenience wherever and whenever you are.A must-have and worhty gift for the family.