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Sennheiser PXC 550-II Wireless Headphone with Alexa Built-In, Noise Cancellation and Smart Pause - Black: Amazon.co.uk: Electronics & Photo
Sennheiser PXC 550 Wireless NoiseGard Adaptive Noise Cancelling, Bluetooth Headphone with Touch Sensitive Control and 30-Hour Battery Life - Black: Amazon.co.uk: Electronics & Photo
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Sennheiser PXC 550-II review - Which?
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Sennheiser PXC 550-II: Bose and Sony rival gets upgraded - CNET