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Two-way Notification. When BT tracker and your phone are out of effective range, both your phone and tracker generate beep sound to remind you and help you track it back. Recording Function. Double click the button of tracker to start recording. APP Remote Control. Download free APP, then pair it with your phone. And the BT tracker will generate "beep" sound within effective range when you press the button. Smart Tracker. Attach BT tracker to daily items such as car keys, kids' bags, wallets or pets' collars, then use our free app (Support iOS 11.0 and Android 8.0 above system) to track them. Easy to Carry. This tracker is small and lightweight, easy to carry like a key chain hanging on your kids' schoolbag or pet's collar, etc.