Apple Find My Certified (iOS only): No installation required, simply connect with the built-in Find My feature. With Find My's advanced encryption, you can be assured that no one, not even the iPhone or UGREEN, will be able to see your tag locations. Replaceable battery: Uses a CR2032 button cell battery, with a lifespan of up to 24 months. The device will remind you when the battery is low, so you can easily replace it on time. Safe and sturdy: UGREEN FineTrack has received UL4200A certification, and its structure is safe and robust, preventing children from easily opening the cover and accidentally swallowing button batteries. Extra loud alarm & global tracking: Built-in buzzer with up to 80 dB; can be located via “Find My” or Siri. Items can be tracked globally through the Find My network as long as an iPhone is nearby. Left-Behind Reminder: The Bluetooth tracker automatically displays a reminder on your phone when you are a certain distance away from the item. This distance depends on environmental interference. Share information: Smarttag supports sharing object information with up to 5 iPhones, and one iPhone can support up to 32 Smarttag connections. You no longer have to worry about family and friends not being able to find the items. Note: After receiving the UGREEN FineTrack, please watch the video tutorial “(e.g.) How to connect and reset your phone” on this page. Further assistance can be found in the user manual included in the packaging.