Product description from manufacturer
Sony's MDR-IF8000 Headphones allow you to enjoy the surround sound equivalent of 6 speakers when you using your MDR-DS8000 Infrared Cordless Digital Surround Headphone System. In addition, you are able to enjoy surround sound anywhere within 33 feet of the transmitter. Also featuring Gyro head tracking which creates a realistic sound, these Headphones are powered by either rechargeable batteries or dry batteries and are easy to operate. Plus the MDR-IF8000 will enable more than one person to listen as you enjoy "best seat" theater-quality listening and pump up the volume!
