Google is introducing an improved two-factor authentication system for Gmail and other services that uses a tiny hardware token that will only work on legitimate Google sites. The new Security Key system is meant to help defeat attacks that rely on highly plausible fake sites that are designed to capture users credentials. The hardware Security Key is a small USB token that implements the FIDO Alliance s Universal 2nd Factor specification. It’s meant for users who require a higher level of security on their accounts and users can buy them from Amazon or other retailers now.
Source: https://threatpost.com/google-adds-hardware-security-key-for-account-protection/108943/