Easy to Use: This item tracker supports iOS/Android 4.3 or later (Bluetooth 5.0 required). 1) Scan the QR code in the instruction manual; 2) Press and hold the button for 3 seconds. After hearing 3 beeps, the tracker will power on, and the indicator light will flash for 10 seconds; 3) Connect your phone to the tracker via Bluetooth; 4) Press and hold the button for 3 seconds until you hear a long beep, after which the device will power off. Android phone users should open the GPS app before connecting.Two-Way Anti-Loss Tracker: This smart key tracker is a practical gadget that alerts you when you're about to forget something. Both your phone and the key tracker will sound an alarm if the connection is lost. When your phone is lost, double-click the tracker's button to trigger the phone alarm; alternatively, after losing the anti-loss device, you can view its map location through the app or tap the alarm, and the tracker will also sound an alarm. One phone can connect to multiple trackers.Versatile Use: This key tracker is an excellent anti-loss alarm that helps you find and locate those items that are always hard to find. You can attach it to your phone, keys, bag, umbrella, pet (dog, cat), wallet, handbag, suitcase, pet collar, and other important items for quick and easy location, bringing you convenience and helping you avoid any loss in your life; the tracking range is approximately 90 feet (about 27 meters).An excellent gift choice: This key finder is lightweight and portable, featuring a portable round carabiner for easy carrying without taking up much space; you can also place or hang it on any item you need to track, providing convenience anytime, anywhere. It's a thoughtful and essential gift for family members.