The Apple AirTag 4-pack features a small, circular design the size of a coin, making it ideal for attaching to keys, bags, or other items. It incorporates technologies such as low-energy Bluetooth for nearby location tracking, Apple's U1 chip supporting Ultra Wideband technology for precision finding, NFC to activate Lost Mode, a built-in speaker for sound alerts, and an accelerometer to detect movement. The AirTag operates on a replaceable CR2032 battery that lasts for approximately a year. It is compatible with iPhones and iPads running iOS/iPadOS 14.5 or later. Apple ensures user privacy by encrypting all data, and no location or movement history is stored on the AirTag. Communication through the Find My network is anonymous and secure. The AirTag is water and dust resistant with an IP67 rating, can be easily set up with a single tap via the Find My app, and can be shared with up to 5 people for tracking shared items. Apple also offers free engraving options to customize each AirTag when purchased from its official store.