Apple finally unveiled its much-awaited item-trackers AirTag. The $29 device helps you find your key through its U1 chip using Ultra-Wideband technology and Bluetooth. Here’s how it works, and how it maintains your privacy while being capable of being located by other people’s phones. The U1 chip uses a 6-8.5GHz frequency band to transmit signals at a short-range to help you locate items using the Find My app on your iPhone.