You can set up 2-Step Verification with the following devices:
Want to use a hardware security key? (optional)
We support any U2F compatible device, including all of the current Yubikey devices. If you do not need any additional features, then the basic $18 Fido U2F Security Key connects via USB and will suffice for desktop use. If you want to use the security key on your android phone too, you will need the Yubikey Neo device which supports NFC as well as USB.
You can use the following website to choose your desired Yubikey: https://www.yubico.com/products/yubikey-hardware/
Note: At this time you can only set up 2-Step using a desktop device (you cannot log into your account and set up 2-Step on a mobile device)