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: Geekria QuickFit Replacement Ear Pads for Sennheiser PXC 550 PXC 550-II Wireless MB 660 Series Headphones Ear Cushions, Headset Earpads, Ear Cups Cover Repair Parts (Black) : Electronics
Sennheiser PXC 550-II: Bose and Sony rival gets upgraded - CNET
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-II wireless noise-canceling headphones are $190 off | Mashable
Sennheiser PXC 550 Wireless review: A full-size Bluetooth headphone with active noise canceling that rivals Bose QC35 - CNET
Sennheiser PXC 550-II Wireless: Main Discussion
Sony WH-1000XM4 vs Sennheiser PXC 550-II - SoundGuys