The Sennheiser CXC700 stereo in-ear earphones is perfect for demanding businessmen in travel and for people frequent-flyer. These earphones incorporate NoiseGard ™ technology that helps in minimizing distracting ambient noise. The advanced acoustic system of these earphones delivers astounding clarity and excellent sound quality. The 3.5 mm angled jack permits you to use these earphones with most entertainment systems such as MP3 players, iPod, iPhone and many other mobile phones. These earphones with a distinctive metalized finish, has ergonomic design to offer exceptional comfort. The single AAA 1.5 V alkaline battery works up to 16 hrs efficiently to ensure optimum performance. The included convenient transport case allows you to keep these earphones safe and secure.