Sony MDR-DS3000 Wireless Digital Surround Headphones (Discontinued by Manufacturer) Comfortable, cordless, open-air headphones with a 23 foot transmission range and a 90 transmission angle Incorporates Sony VPT Virtual Phones Technology, with 125 million instructions per second Logic 3D processor Optical digital input allows use with Dolby Digital and PCM audio Gold-plated analog input for noise-free Dolby stereo and pure stereo sources Ideal for DVD players and other components with Dolby Digital, Dolby Surround or DTS Surround Sound