Audio 2000s 6952UF Portable UHF Wireless Microphone with Lavaliers and Headband Headsets Combination UHF Band 551 - 581 Mhz with Selectable frequency that can be changed manually or automatically 100 Adjustable Channels per transmitter. These 100 have 6 subchannels each (Totals 1200 selectable frequencies to be help with fine tuning) One 3.5mm TRS earphone output and level control on the front panel & One 3.5mm TRS AUX output on rear panel Two independent balanced XLR output and one mixed unbalanced 1/4" output for your preference of connection Operating Range up to 300ft (within line of sight)