Amazon.com: Sennheiser PMX 684i Fitness Workout Sports Running and Cycling Earbud/in ear Ultralight Compatible with Apple/iPhone/iPad Neckband Headphone Grey/Green color Headset sweat and water resistant : Electronics
Amazon.com: Sennheiser HD1 In-Ear Wireless 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 : Electronics
Sennheiser PMX 70 Sport Neckband headphones at Crutchfield
Amazon.com: Sennheiser HD1 In-Ear Wireless 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 : Electronics
Sennheiser PMX 684i Sports Neckband Earphones Inc In-Line Remote and Mic (Apple) - Green | ProBikeKit.com