Sennheiser CX300  II  CX 300 II Precision Enhanced Bass Earbuds, Black Plastic Imported Connectivity Technology: Wired Dynamic transducers deliver powerful, bass-driven sound 16-ohm impedance is ideal for use with cell phones, tablets and portable music players In-ear-canal design provides ambient noise isolation to improve listening experience 1.2 m asymmetrical cable with 3.5mm right-angled plug;the longer end goes behind the neck and into the opposite ear Soft silicon ear-tips (S, M, and L size included) to optimize fit for comfort and sound quality