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Amazon.com: Sennheiser HD1 In-Ear Wireless Headphones, Bluetooth 4.1 with Qualcomm Apt-X and AAC, NFC one touch pairing, 10 hour battery life, 1.5 hour fast USB charging, multi-connection to 2 devices : Electronics
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Amazon.com: Sennheiser HD1 Wireless Headphones with Active Noise Cancellation - Black (Discontinued by Manufacturer) : Electronics
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