Sennheiser HD 4.40 wireless headphones drop to their lowest ever at $70
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Sennheiser HD 4.40 BT Wireless Review - RTINGS.com
Sennheiser HD 4.50BTNC review: Top notch hi-fi headset, with noise cancelling too | Technology News,The Indian Express
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stereonomono - Hi Fi Compendium - 13 years on-line: Sennheiser HD40 headphones
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