DESC: Small and discrete, the Sennheiser CX300-II Precision in-ear headphones boast high-quality dynamic speaker systems for powerful, bass-driven stereo sound. They have an excellent fit and a high reduction of ambient noise. Ear adaptors in three different sizes are also included, as well as a convenient carrying pouch. The CX300-II Precision in-ear headphones are ideal for use with all MP3, iPod, iPhone, DVD and CD players, and portable gaming systems.