Panasonic RP-WF930-S 900 MHz Wireless Headphones (Discontinued by Manufacturer) Wireless headphones with 900 MHz FM transmission and up to 200 foot range 40 mm diaphragms for dynamic, full-bodied sound Closed-ear design lets you listen in private without disturbing others Surround-sound effect creates a spacious listening environment right between your ears Includes charging station and a rechargeable battery good for up to 20 hours of use