FM Systems
FM systems can be provided based on individual student needs. They provide an improved signal to noise ratio regardless of the teacher's distance from the child. These instruments ensure that the teacher's voice is consistently heard above background noise.
Resources:
http://www.phonak.com/consumer/products/fm.htm
http://www.oticon.com/com/OurProducts/ConsumerProducts/FmAndTeleloopSolutions/index.htm