Plantronics .Audio DSP 400 digitally-enhanced foldable stereo headset with full-range stereo sound. The foldable design allows for easy storage and transport. Listen to your CDs, DVDs, or MP3 files. Its noise-canceling microphone enhances speech accuracy. Plantronics PerSono Audio Control Center Software available via internet download. The PerSono Audio Control Center Software allows users to adjust microphone and audio characteristics like volume, bass and treble, launch their favorite voice or audio applications, as well as select audio presets like rock, jazz or classical, all from a central software interface. Features: Folds for easy storage and transport Connect with an analog connection or use the included USB connection to ensure consistant sound quality Noise canceling microphone QuickAdjust microphone boom Inline digital volume and mute controls PerSono Audio Control Center Software(via internet download) Optimized for Skype , Windows Live, and Yahoo! Messenger Manufactures product#: 76921-01