Amazon.com: Sennheiser PC 131 Binaural Headset with Volume Control and Microphone Mute : Everything Else
User manual Sennheiser PC 131 (English - 1 pages)
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Sennheiser PC 131
Sennheiser PC 131 Binaural Headset with Volume Control and Microphone Mute : Everything Else - Amazon.com