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Sennheiser HD4.40 BT Bluetooth Wireless Headphones - Newegg.com
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Sennheiser HD4.40 BT Bluetooth Wireless Headphones - Newegg.com
Sennheiser HD 4.40 BT Review: Quality wireless audio, but is it worth the price?
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Sennheiser HD 4.40BT Wireless Headset (Review)
Review: Sennheiser HD 4.40 BT Wireless - Headphonesty