Apple Airtag

Dimensions and weight: Diameter: 31.9 mm, Thickness: 8.0 mm, Weight: 11 g.
Connectivity: Bluetooth for nearby search, Apple U1 chip (Ultra Wideband) for Pinpoint.
Power: Replaceable CR2032 battery.
Protection: IP67 water and dust resistance (up to 1 meter of water for 30 minutes).
Sound: Built-in speaker for alarm.
Compatibility: Apple devices (iPhone, iPad) with iOS 14.5 or later.

Find My: AirTag uses a network of hundreds of millions of Apple devices to find you, even from a distance.
Precise search: iPhones with the U1 chip (iPhone 11-15+) show the direction and distance to the tag.
Lost Mode: If you lose your AirTag, you can activate a mode that allows anyone who finds it to receive the owner's contact information via NFC.
Privacy: Data transmission is anonymous and encrypted.
Personalization: Free engraving (emojis, initials) is available when purchased from Apple.