Google is discontinuing the Bluetooth Titan Security Key to focus on security keys with Near Field Communication (NFC) functionality. As part of this move, Google has also announced a new. Titan Security Keys were introduced in 2018 and are designed to help users prevent Google account takeover attempts using credentials stolen in data breaches or following phishing attacks. Google advises anyone at risk of targeted online attacks, including but not limited to business leaders, journalists, activists, and IT administrators, to enroll in Google’s Advanced Protection Program.
Source: https://www.bleepingcomputer.com/news/google/google-drops-bluetooth-titan-security-keys-in-favor-of-nfc-versions/