Sennheiser XSW 1-ME3 A-Band Headset, Diversity UHF Wireless System, With antenna diversity, Frequency range: A-Band, 548 - 572 MHz, Bodypack transmitter, ME 3-II condenser headset microphone with cardioid polar pattern, 24 MHz switching bandwidth, 8 Frequency banks with 10 channels each, Integrated antennas, Scan function for locating available frequencies, Audio frequency range: 50 - 16,000 Hz, XLR and jack output, Adjustable squelch, Mic-Line switchable@+*Set consists of:*@+@+, 1x SK-XSW bodypack, 1x EM-XSW1 diversity desktop receiver, 1x ME 3-II microphone, NT 12-5 CW power supply, 2x AA batteries