Sennheiser Bluetooth Headphones with Microphone MB 660 UC with Active Noise Canceling - Global Teck
Sennheiser MB 660 review: Sounds like a winner | ITPro
Sennheiser MB 660 UC - Dual-Ear Headset with Noise-Canceling Microphone - Includes USB Bluetooth Dongle | Headphone Reviews and Discussion - Head-Fi.org