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Plantronics 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, and enjoy the benefits of the noise-canceling microphone, which enhances speech accuracy. Plantronics PerSono Audio Control Center Software is available via internet download and 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. USB connectivity makes installation a breeze, and there's no sound card required.