The JR900 stereophone system operates on a 900MHz radio frequency band, one of the highest power band for cordless stereophones available on the market. The JR900 consists of a high quality, battery operated stereophone, the RF transmitter, and an AC adapter. Utilizing a radio signal, the JR900 allows the listener to move freely from room to room and outdoors without the need for additional transmitters or experiencing signal breakup. The signal can be transmitted through walls, ceilings, and floors and is not affected by bright sunlight. Listeners can roam freely over 70,000 square feet within the signal. Finish cleaning the attic while keeping an ear on your favorite soap operas. Work out in the garden or garage while tuning into the Sunday afternoon football games. Or just lounge around on the deck on a summer evening with a live symphony broadcast. Combing the Sound of Koss with the latest in RF technology, the JR900 is Koss' answer to music lovers' need for true stereo and cordless freedom.