Shure BLX14R/SM31 T11, Radio set, SM Presenter series, UHF Wireless system with BLX1 Bodypack and SM31 headmic set, Up to 3 systems simultaneously, Pilot tone, Microprocessor controlled antenna diversity, Quick scan feature to find free frequencies, Condenser SM31 microphone capsule with frequency range 45 - 20,000 Hz and cardioid, 9.5"" / 1 U Metal receiver, Removable BNC antennas, XLR- and jack output, LCD with HF and Audio indicators, Frequency range: T11 (863 - 865 MHz), Includes rack mount kit