Shure BLX14R/MX53 T11, UHF Wireless System, SM Presenter series, BLX1 Bodypack, MX153 Earmic set, Up to 3 systems simultaneously, Pilot tone, Microprocessor controlled antenna diversity, Quick scan feature to find free frequencies, Condenser Earmic set MX153, 20 - 20,000 Hz, Ball, 9.5"" 1U Metal receiver, Removable BNC antennas, XLR and jack outputs, Audio status LED's, Frequency range T11 863 - 865 MHz, Includes rack mount kit