UniPak system with PRO8HEcW, 52 channel, Up to 1001 selectable frequencies, Frequency Response 70 Hz - 15 kHz, Rack mountable, True Diversity, PRO8HEcW hypercardioid dynamic headworn microphone, HRS 4-pin connector, High: 30 mW low: 10mW RF Power, Operating range 100m, Up to 6-8 hours battery life