Amazon.com: SENNHEISER PXC 550-II Wireless NoiseGard Adaptive Noise Cancelling, Bluetooth Headphone with Touch Sensitive Control and 30-Hour Battery Life, Black : Electronics
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Sennheiser PXC 550-Il Ear-Cup Over the Ear ANC Wireless Headphones - Black | eBay
User manual Sennheiser PXC 360BT (English - 35 pages)
Review: Sennheiser's PXC 550 Wireless Headphones Should Put Bose on Notice - MacRumors