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EPOS | Sennheiser Adapt 160 USB II (1000915) - Wired, Double-Sided, UC Optimized Headset with USB Connectivity - Superior Stereo Sound - Enhanced Comfort - Call Control - Black
User manual Sennheiser SC 165 USB (English - 2 pages)
Sennheiser SC 165 USB (508317) - Double-Sided (Binaural) Headset for Business Professionals | with HD Stereo