Add on Flesh Tone Single Over-ear Mic Kit. User selectable wireless Panel Mount Receiver (factory installed). Frequencies 514 to 544 MHz. Wireless 96 Channel UHF Flesh Tone Single Over-Ear/Headset Electret Mic Kit - unidirectional, user selectable wireles Panel Mount Receiver and bodypack transmitter requires two "AA" batteries (included). Frequencies 514 to 544 MHz. Used with SW925-96.