Sennheiser HD1 On-Ear Headphones with integrated microphone
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 IE 400 PRO In-Ear Headphones IE 400 PRO CLEAR B&H
Sennheiser IE 400 PRO – Dynamic In-Ear Monitoring Headphones
Amazon.com: Sennheiser Pro Audio IE 40 PRO, molded in ear dynamic monitors (Clear) : Musical Instruments
Sennheiser MOMENTUM In Ear True Wireless Headphones - Black for sale online | eBay