Smart tracker. Attach the BT to everyday objects such as car keys, children's bags, wallets or pet collars, then use our free app (supports iOS and Android systems) to track them. APP remote control. Download the free app, then pair it with your phone. And the BT will generate a "beep" sound when you press the button via APP within 98 feet (Open Space). Two-way notification. When the BT and your phone are out of effective range, your phone and your will generate a beep sound to remind you and help you find it. Easy to wear. It's small and lightweight, easy to carry around like a key ring hanging on your kids' schoolbag or your pet's collar. Tracker. It shows the location where BT disconnects via APP to help you find your things or find your car in the parking site.