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Sennheiser CX 7.00BT Wireless Neckband In-Ear Headphones with Built-In Remote and Microphone (Black) - Newegg.com
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Sennheiser Consumer Audio CX 6.00 BT Wireless in-Ear Headphones, Bluetooth 4.2 with Qualcomm Apt-X, 6-Hour Battery Life, 1.5 Hour Fast USB Charging, Multi-Connection to 2 Devices, Black : Electronics - Amazon.com
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