Sennheiser MB 660 UC - Dual-Ear Headset with Noise-Canceling Microphone - Includes USB Bluetooth Dongle | Headphone Reviews and Discussion - Head-Fi.org
Sennheiser MB 660 UC MS Bluetooth ANC Stereo Headset 507093 B&H
EPOS I SENNHEISER IMPACT MB 660 UC MS - Headset - full size - Bluetooth - wireless - NFC - active noise canceling - Walmart.com