Trantec S5.3W wireless aerobics system features the HM66 aerobic headset microphone which is a specifically designed hands free microphone for sports and aerobic instructors, as well as Television Journalism, transportation, warehousing and the restaurant industries, in fact where ever actions are demanded. Trantec S5.3W gives up to 640 selectable frequencies and USB computer monitoring via USB connectivity on receiver. S5.3W also features 11MHz of bandwidth that will enable you to run up to 12 channels simultaneously at a price you will find hard to match.