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Brand New Sennheiser CX 6.00BT Wireless In-Ear Headphones Bluetooth 4.2 with Qualcomm Apt-X - Black | Wish
Amazon.com: 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
Sennheiser IE 600 | Headphone Reviews and Discussion - Head-Fi.org