Google Titan Security Key K9T Titan Security Key K9T (USB/NFC), used for phishing-resistant two-factor authentication (2FA), works with Google and many other services that support FIDO standards. It is built with a hardware chip that includes firmware engineered by Google. Titan Security Keys work with popular browsers and a growing ecosystem of services that support FIDO standards. They are built with a hardware chip that includes firmware engineered by Google to verify the integrity of the key. Titan Security Keys implement FIDO standards for 2FA using cryptography to verify a user??s security key and address of the login page. Security keys help defend against the consequences of phishing attacks and help prevent account takeovers. Titan Security Keys are built with a hardware chip that includes firmware engineered by Google to verify the key??s integrity. This helps to ensure that the keys haven??t been physically tampered with. One security key can be used to authenticate to many work and personal services. The Google Titan Security Key K9T is the USB key fob. Other Google Titan Security Key K9T features: Works seamlessly with Advanced Protection: Titan Security Keys are compatible with the Advanced Protection Program, Google's strongest security offering. Backed by Google: Firmware for Titan Security Keys is engineered by Google, to verify the key??s integrity. One key, many accounts: Titan Security Key is built on FIDO? open standards. Use your key to protect your sign-in on a variety of apps and online services beyond Google. Tech Specs Dimensions & Weight USB-A/NFC Security Key Length: 1.7 in (43.9 mm) Width: 0.8 in (20.8 mm) Height: 0.1 in (3.1 mm) What's in the box 1USB-A/NFC Security KeyX (no retailbox)