Blizzard today announced the Blizzard Authenticator, a keychain security device that adds greater protection against World of Warcraft account theft and hijacking.

The hardware, once associated with a WoW account, will provide a six digit code that must be provided when logging into the game. It will be valid for one use only, with each code generated on the press of a button. The device can be linked to multiple accounts.

Making its debut at this weekend’s Blizzard Worldwide Invitational event, the device will sell for $6.50. It will be made available on Blizzard’s online store at the same price soon thereafter.