Wireless learning not only helps boost student self-esteem and independence, but creates more flexible classroom environments for individuals or smaller groups of differentiated learners. This 4-person Infrared Headphone set is designed for use with classroom based computer programs (Mac and Windows compatible) and is ideal for reading and language development. The headphones have adjustable headbands with ambient noise-reducing earcups to help block out external distractions and keep students on task. There is no limit to the number of listeners so long as they're within the 15' transmission range with a clear line of sight between the headphone and transmitter. Additional headphones (HIR-HP1) can be purchased for expanding the group activity without the need for a second transmitter.