User manual Sennheiser MB 660 UC (English - 37 pages)
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Sennheiser MB 660 UC - Dual-Ear Headset with Noise-Canceling Microphone - Includes USB Bluetooth Dongle - Reviews | Headphone Reviews and Discussion - Head-Fi.org
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Manual Sennheiser MB 660 (page 15 of 37) (English)
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Sennheiser MB 660 UC - Dual-Ear Headset with Noise-Canceling Microphone - Includes USB Bluetooth Dongle - Reviews | Headphone Reviews and Discussion - Head-Fi.org