Best Buy: Sennheiser PXC 550 Wireless Over-the-Ear Noise Cancelling Headphones Black PXC 550
New Release: Sennheiser PXC 550 - Major HiFi
Amazon.com: SENNHEISER PXC 550-II Wireless NoiseGard Adaptive Noise Cancelling, Bluetooth Headphone with Touch Sensitive Control and 30-Hour Battery Life, Black : Electronics
Sennheiser PXC 550 Wireless Headphones - Black | eBay
Sennheiser PXC 550-II review: Great sound and ANC - SoundGuys
Amazon.com: SENNHEISER PXC 550-II Wireless NoiseGard Adaptive Noise Cancelling, Bluetooth Headphone with Touch Sensitive Control and 30-Hour Battery Life, Black : Electronics
Amazon.com: SENNHEISER PXC 550-II Wireless NoiseGard Adaptive Noise Cancelling, Bluetooth Headphone with Touch Sensitive Control and 30-Hour Battery Life, Black : Electronics