Black & Silver EPOS BT Headset - Model MB 660 UC MS (Article - 507093)
Product Review: Sennheiser MB 660 UC | Smarter Together
Sennheiser MB 660 UC MS Headset Review - UC Today
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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
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