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Sennheiser MB 660 UC - Dual-Ear Headset with Noise-Canceling Microphone - Includes USB Bluetooth Dongle | Headphone Reviews and Discussion - Head-Fi.org
Presence Grey UC Bluetooth Headset w/Dongle by Sennheiser | Business Telecom Products
EPOS Sennheiser MB Pro 2 ML - Bluetooth UC Headset - Includes USB Dongle for Microsoft