Smart Tracker Tag for Find Nearby: When the luggage tracker tag is within Bluetooth range(50-200ft), you can use the "Find My" app"Palysound" to locate lost items, or simply ask Siri for help. The built-in speaker (loud, 80-100dB) plays a beep sound to help you find items.Air Tag with Lost Reminder: When the tracker exceeds the Bluetooth range, a notification pops up on your iPhone. If you have already moved away, you can use the "Find My" app to view the lost location on the map. (No cost,no subscription fee )Bluetooth Smart Tag for Find Far Away: If your lost item is within Apple's signal range, the "Find My" network connected to billions of iOS devices worldwide will guide you to nearby or update your belongs the newest location. Meanwhile,MFi Certification the anonymous and encrypted network also protects your privacyReplaceable Battery & IP67 Waterproof & Dust Resistant: The luggage Air trackers tag 4 pack comes with a standard replaceable battery that can check the battery status in the Find My App.With an IP67 Waterproof can handle splashes, rain, and brief immersion.Air Tracker Tag with Lost Mode:Set Lost Mode for your bluetooth tracker tags,When binding your phone, your tags cannot be matched with a new device. When someone pick up your belongs,and he can view your contact information.Besides, when its detected by an Apple device in the network, it will auto-update its location.