The JR170 operates on a 900 mHz radio frequency band. The system consists of a high quality, battery-operated stereophone, RF transmitter and AC adapter. Utilizing a radio signal, the JR170 allows listeners to move freely from room to room, even outdoors without the need for additional transmitters or experiencing a signal break. The signal can be transmitted through walls, ceilings and floors and is not affected by bright sunlight. Listeners can roam freely over 150 linear feet.