3 of 4 people found the following review helpful
Verified Purchase(What is this?)
This review is from: Battle.Net Authenticator (PC CD) (CD-ROM)
Easy to set up and great to know my account is more sucure.
You have to have one also to use the RMAH in Diablo 3 for buying or selling.
Get one if you play WoW, D3 or Starcraft.