This is a Wired Headset Overview Offering a powerful, bass-driven stereo sound with greater clarity and improved dynamics are the CX 300-II Precision Black ear-canal phones. The various sizes of ear adapters (S/M/L sizes) provided in the package allow for a personalised fit as well as a high passive attenuation of ambient noise. Also, the asymmetrical cable design ensures a high wearing comfort as you listen on the go. Features - High-quality dynamic speaker systems for powerful, bass-driven stereo sound - Excellent fit in the ear canals and high attenuation of ambient noise (ear adapters in different sizes included) - Convenient carrying pouch included - Optimised for MP3, iPod, iPhone, CD players and portable gaming systems (iPod and iPhone are trademarks of Apple Inc. registered in the U.S. and other countries) - Asymmetrical cable What's in the box Sennheiser CX 300-II Precision 2.5mm Headphones Carrying pouch