Sennheiser Sound Card Adaptor for Gaming Headsets (3DM1 Adaptor) USB connectivity to PC Delivers 7.1 Surround with Dolby Headphone Slide top on/off switch to activate 7.1 Surround Compatible with all headsets using 2 x 3.5mm plugs Exceptional audio performance when combined with Sennheiser GAME ONE and GAME ZERO headsets USB connectivity to PC Slide top on/off switch to activate 7.1 Surround Compatible with all headsets using 2 x 3.5mm plugs Exceptional audio performance when combined with Sennheiser GAME ONE and GAME ZERO headsets