The Turtle Beach Call of Duty : Black OPS II Ear Force Sierra Limited Edition Headset is fully equipped for battle with programmable audio presets, Dolby Digital 5.1 Surround Sound, interchangeable speaker plates, and a state-of-the-art control unit. Featuring official Call of Duty : Black Ops II optimized audio presets and exclusive color scheme and speaker plates, the Ear Force Sierra is the weapon of choice to bury the opposition.