The TV - Ears Digital transmitter is placed on a flat surface facing the seating area. It simply connects to your TV, cable box, or satellite box equipped with any Optical, Coaxial, 3.5 to 3.5, or RCA audio out ports. The transmitter then sends audio wirelessly to the headset worn by the user. Volume and tone adjustments are available on the headset for creating perfect dialog clarity. TV - Ears works separately from the TV volume so the TV can be turned down or muted, and is compatible with any television.