Sennheiser CX300 II CX300-II Precision Bass-Driven In Ear Earphones Headphones | eBay
Sennheiser CX 300-II headphones
Original Sennheiser CX300 II Precision In Ear only Headphones Deep Bass Earphones 3.5mm Wired Stereo Music Headset Sport Earbuds|Earphones| - AliExpress
Amazon.com: Sennheiser CX300 II CX 300 II Precision Enhanced Bass Earbuds, Black (Discontinued by Manufacturer) : Electronics