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
Best Buy: Sennheiser CX 400BT True Wireless Earbud Headphones Black CX400TW1 Black