Users will have to activate the security key on their device before it works, and it's only compatible with Chrome browsers on Bluetooth-enabled Chrome OS, macOS X and Windows 10 devices. Users will also need to have another two-step verification method set up -- like receiving an SMS code or using the Google Authenticator app. That method will be used on mobile devices and browsers other than Chrome, and it'll be helpful in the event that you lose your phone. The built-in security key works with both standard and business Google accounts. While this new method of verification won't work everywhere you might log in with your Google account, it'll make getting set up on your main computer a good bit quicker.