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Amazon.com: Sennheiser PXC 550 Wireless – NoiseGard Adaptive Noise Cancelling, Bluetooth Headphone with Touch Sensitive Control and 30-Hour Battery Life : Electronics
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Sennheiser Noise Canceling Headphones: PXC 550 Wireless; HD 4.5 BTNC; HD1 Wireless; and HD1 On-Ear Wireless | Stereophile.com
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Sennheiser PXC 550 Wireless review: A full-size Bluetooth headphone with active noise canceling that rivals Bose QC35 - CNET
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Auscultadores Noise Cancelling Bluetooth Sennheiser PXC 550-II - Auscultador c/ Redutor Ruído - Compra na Fnac.pt
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