The Plantronics .Audio 750 DSP headset employs DSP technology for unmatched audio quality for rich stereo music, DVDs, gaming, and Internet calling. Use an analog connection into your PC or the included USB sound card. The QuickAdjust? microphone minimizes background noise for callers, while the lightweight, adjustable headset is comfortable for hours. Connect using analog or the included USB sound card?it's that easy.