Why use FM auditory assistance devices versus infrared?
Infrared systems use infrared light to transmit the audio signal. When this light is blocked, the signal stops. Thus, infrared systems are susceptible to people and objects getting in the way. And, infrared systems do not work in sunlight. Another problem with infrared systems is the cost, complexity and unsightliness of installing emitter panels. Infrared systems offer the advantage of security (you can only hear the audio when infrared light is detected by the receiver) and simplicity of receivers (one receiver is used and it does not have to be tuned). FM systems can transmit through objects and operate as effectively in sunlight as they do indoors. FM systems are much easier to install and they cost much less.
