Sennheiser CX400 & (Fake) Sennheiser CX400 - II - YouTube
Sennheiser CX400-II-B In-Ear Headphone with Dynamic Speaker System and Integrated Vol Controls (Discontinued by Manufacturer)
Sennheiser CX 400BT True Wireless Earbuds - Bluetooth In-Ear Headphones for Music and Calls - with Noise Cancellation and Customizable Touch Controls, White