Looking for an additional set of headphones for your Sony Mobile DVD Dream System? The MDR-IF140 is a Universal Wireless Headphone that is compatible with the MV-7101DS and virtually any Audio/Video system with (IEC standard) an analog infrared audio transmissions. The headphones feature a Lightweight, Open-air Design which allows you to hear ambient sound. Additional features include 30 mm drive Units for deep bass, Up to 60 Hours of Battery Life (with AAA battery), a Transmission Range up to 24 feet, and a Transmission Coverage Angle of up to 90°. Listen for hours on end with the MDR-IF140.