Amazon.com: Sennheiser Momentum in-Ear Wireless Black 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 :
Sennheiser CX 350BT Wireless Neckband Headset - Black for sale online | eBay
Sennheiser CX 6.00BT Wireless in-Ear Neckband Headphones, Bluetooth 4. – Juan Gadget
Amazon.com: Sennheiser Momentum in-Ear Wireless Black 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 :