Sennheiser  PC 25-S Monaural Single-Sided Headset with Noise-Canceling Microphone & Excellent Clarity/Voice Recognition Built in USB sound card provides superior accoustics Adsjustable and pivotable boom makes mic positioning easy and for clear speech. Noise cancelling mic allows for excellent clarity and voice recognition Plug and play for effortless connection to PC or laptop Rugged and very lightweight for hours of comfortable use