Samson's Concert 99 Ear set combines 80 channels of high-definition audio and extreme reliability into a rugged all-metal, rack-mountable chassis with a stage-ready backlit display. With simple 1-touch setup, convenient monitoring, a 300' UHF operating range and impressive transmitter battery life, this frequency-agile system offers unprecedented value to presenters, educators, house of worship speakers, fitness instructors and others in search of reliable wireless freedom.