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Sennheiser PXC 550 Wireless — Audiophilia
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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
Sennheiser PXC 550 Review. Best Wireless Noise-Cancelling Headphones? – Headphones.com