authenticator is a 3" by 1" token, sorta the size of a typical car's keyless entry remote. You can plop it on your computer, stick it in your pocket, or attach it to your keychain and take it with you wherever you go.

I have one and love the security of it. All my accounts are in a b.net account with the authenticator tied to it. Best $17usd I ever spent (have to pay shipping to get it to Canada...at least they charge a reasonable $10 shipping now instead of $80 like originally)


Only problem is now the wife knows that she can just hide the authenticator if I get wife aggro and prevent me from playing...maybe I should keep it on my person at all times to prevent that lol...I just leave it on my computer desk at home.