Sony MDR-IF245 Wireless Headphone is Open air dynamic headphone with PET diaphragm for dynamic, movie-quality sound. The headphone has Sound Mode Switch for Movie And Music Enjoyment. It has Ear-Conscious Design for Wearing Comfort.40mm Driver Unit with High Power Neodymium Magnet in Sony MDR-IF245 Wireless Headphone gives Outstanding Sound Quality. These rich Features in such budget friendly package makes Sony MDR-IF245 Wireless Headphone a must buy.