SteelSeries Siberia Elite Headset with Dolby 7.1 Surround Sound (Anniversary Edition) Next-generation SteelSeries-proprietary 50mm speaker drivers with dual neodymium magnets deliver rich sound and low frequency power Dolby Headphone and Dolby Pro Logic IIx surround sound technologies for up to a virtual 7.1-channel immersive audio experience* Closed-back design for outstanding accuracy, clarity, and detail, Retractable unidirectional microphone for crystal clarity Advanced audio customization including 10-band EQ, mic volume control, mic background noise rejection, auto mic gain, custom sidetone* Perfect-fit suspension design provides self-adjusting, durable structure and lightweight, comfortable experience, Memory-foam ear cushions and headband for long wearing comfort