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Best Buy: Sennheiser HD 4.50 Wireless Noise Cancelling Over-the-Ear Headphones Black HD 4.50 BTNC
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Review: Sennheiser HD 4.40 BT Wireless, HD 4.50 BTNC Wireless and Sennheiser PXC 550 Wireless - Son-Vidéo.com: blog
Sennheiser's headphones might just be the best in class | Salon.com
Sennheiser HD 4.50BTNC review | What Hi-Fi?
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Sennheiser HD4.50 BTNC review: Excellent noise cancellation and a fantastic battery life - The Economic Times
Sennheiser HD 4.50 BTNC review | Tom's Guide
