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Replacement Ear Pads Cushions for Sennheiser PXC 550 PXC 550-II Wireless MB 660 PXC480 Series Headphones Earpads, - Walmart.com
Sennheiser MB 660 UC (507092) - Dual-Connectivity, Wireless with Noise– Wholesale Home
User manual Sennheiser MB 660 UC (English - 37 pages)
Amazon.com: SENNHEISER PXC 550-II Wireless NoiseGard Adaptive Noise Cancelling, Bluetooth Headphone with Touch Sensitive Control and 30-Hour Battery Life, Black : Electronics