Sennheiser CX300S In Ear Headphones with One-Button Smart Remote 3 colours | eBay
Original Sennheiser Cx300-ii Precision In-ear Only Headphones Deep Bass Earphones 3.5mm Wired Stereo Music Headset Sport Earbuds - Earphones & Headphones - AliExpress
Sennheiser CX 3.00 Earbuds - For smartphones, on-the-go music, entertainment