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Sennheiser PC 131 Binaural Headset with Volume Control and Microphone Mute | Headphone Reviews and Discussion - Head-Fi.org
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Sennheiser PC 7 USB - Lightweight On-Ear Single-Sided Headset - Wired - Passive Noise-Cancelling Microphone for Internet Telephony and E-Learners - Mac, PC, and Laptop Connectivity : Amazon.co.uk: Computers & Accessories
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