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If you're new to security keys, you should think of them as an additional line of defense for your online life. A hacker might have compromised your password, but without access to your physical security key, their ill-gotten gain is valueless.
There are two new Titan keys in the line -- coming in USB-A and USB-C flavors. Both are FIDO2 compatible, which means the devices are compatible with the broadest number of websites and online services, and both have enough built-in storage to store up to 250 unique passkeys.
Google Titan Security Keys tech specs
USB-A/NFC Security Key
Length: 1.7 inches (43.9mm)
Width: 0.8 inches (20.8mm)
Height: 0.1 inches (3.1mm)
Materials: ABS, Calcium carbonate
For use with computers that have USB-A or USB-C ports. Will also work with most Android and iOS devices that support USB or NFC.
USB-C/NFC Security Key
Length: 2.0 inches (50.9mm)
Width: 0.7 inches (18.5mm)
Height: 0.3 inches (7.0mm)
Materials: Polycarbonate + Zinc Alloy
For use with newer computers that have USB-C ports. Will also work with most Android and iOS devices that support USB or NFC.
Also, the USB-A version comes with a USB-A to USB-C adapter.