Best Buy: Sennheiser CX True Wireless Earbud Headphones Black CX True Wireless Black
Sennheiser's latest true wireless earbuds offer noise cancellation for less - The Verge
Sennheiser CX Plus True Wireless Black – Thomann United States
Amazon.com: Sennheiser CX True Wireless Earbuds - Bluetooth In-Ear Headphones for Music and Calls with Passive Noise Cancellation, Customizable Touch Controls, Bass Boost, IPX4 and 27-hour Battery Life, White : Electronics