Infrared works just like white light that you see, except it has a longer wavelength and is not visible to the human eye. The audio signal is transmitted by an infrared beam throughout the room and is received by a receiver designed to receive the signal and process it back to audio for the listener. Ideal for courtrooms, boardrooms, schools, and anywhere that has a lot of radio (RF) interference, using infrared can be the right choice for when you want a clear transmission in a single room without any interference.