Just above the connector is a small LED that flashes when connected to a device, and just above that is a silver, touch-sensitive circle. At one end is a standard USB-C connector, and at the other is a zinc alloy-reinforced hole where you can thread a key ring. It has no moving parts or batteries and doesn't require a network connection. The USB-C Titan Key is lozenge shaped and made of white polycarbonate with silver accents. This review focuses on the USB-C/NFC Security Key, which is out of stock-but only temporarily, I'm told-at the Google Store at the time of this review's publication Google also ditched its bundling scheme and instead offers the USB-C/NFC key for $35 or USB-A/NFC key for $30. I never liked the fob because of its reliance on batteries but it also turned out to be vulnerable to attack. Google has since ditched the Bluetooth device, which is fine with me.

At the time, Google's documentation pushed the idea of having a backup MFA device, so selling two devices made sense. Originally, Google offered a $50 bundle with both a USB-A key and a battery powered Bluetooth fob. The USB-C Titan Security Key grew out of Google's earlier Titan key series.

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