Sennheiser XSW 2-ME3 B-Band Headset, True Diversity UHF Wireless System, With pocket transmitter and ME3-II condenser lavalier microphone with cardioid polar pattern, Frequency range: B-Band, 614 - 638 MHz, Metal housing, 24 MHz switching bandwidth, 8 Frequency banks with 12 channels each, External BNC antennas, Scan function for locating available frequencies, 10 mW Transmitter power, Audio frequency range: 50 - 16,000 Hz, XLR and jack output, Adjustable squelch, Mic-Line switchable@+*Set consists of:*@+@+, 1x SK-XSW pocket transmitter, 1x EM-XSW2 diversity receiver, NT 12-5 CW power supply, ME3-II headset microphone, 2x AA batteries, Rack kit, Bag