Sennheiser PXC 550-II wireless noise-canceling headphones are $190 off | Mashable
Sennheiser PXC 550 II Wireless Noise Cancelling Headphones
Sennheiser PXC 550 review | 51 facts and highlights
Amazon.com: Sennheiser PXC 550 Wireless – NoiseGard Adaptive Noise Cancelling, Bluetooth Headphone with Touch Sensitive Control and 30-Hour Battery Life : Electronics
Sennheiser PXC 550 Wireless review: A full-size Bluetooth headphone with active noise canceling that rivals Bose QC35 - CNET