You will get Battlefield 3: Back To Karkand Expansion CD Key (photo or scan of the cd key from original DVD box). You can activate the key on Origin/EA Downloader. This key can not be activated on Steam platform.
Building on the biggest launch in EA history, Battlefield 3: Back to Karkand is a full-feature digital expansion pack giving gamers more of the explosive multiplayer that Joystiq.com called "mesmerizing," and gameplay that has won over 60 industry awards and continues to delight gamers across the globe in what Seth Schiesel of The New York Times declares, "the most visually realistic shooter on the market." Utilizing the power of Frostbite 2, the Back to Karkand expansion pack remasters four of the most popular Battlefield multiplayer maps in the franchise’s history all with enhanced levels of destruction, including Strike at Karkand, Wake Island, Gulf of Oman and Sharqi Peninsula. In addition to these four new maps , Battlefield 3: Back to Karkand marks the return of the classic Conquest Assault mode from Battlefield 2. A twist on the beloved Conquest mode, Conquest Assault starts one team in command of all control points on the map while the opposing team must assault and take the flags over in order to stop their tickets from bleeding down to zero. Battlefield 3: Back to Karkand also features three new vehicles, ten newweapons, five new dog tags, five new achievements/trophies and an added layer of persistence where players complete assignments to unlock items and earn rewards.