The MDR-RF4000K headphones from Sony provide high-quality audio without the hassle of wires, ideal for use with televisions and home entertainment systems. The headphones use digital RF technology to send audio to the headphones at distances as great as 100' (30m). Simply connect the included transmitter to your television or home theater receiver, and enjoy your favorite shows and music.
The headphones have large 40mm drivers to produce crisp, natural audio with a wide frequency response. The padded headband automatically adjusts to your head to provide a snug and comfortable fit. The closed-back design and thick on-ear cushions provide comfort and also help to block out environmental noise. The headphones have a rechargeable NiMH battery that provides up to 7 hours of continuous operation. The fold-flat design provides convenient storage.