Shure BLX14R/SM35 Q25, Radio set, SM Headset series, UHF Wireless system with BLX1 bodypack and SM35 headmic set, Up to 12 systems simultaneously, Pilot tone, Microprocessor controlled antenna diversity, Quick scan feature to find free frequencies, Condenser headset SM35 with frequency range 60 - 20.000 Hz and cardioid, 9.5"" / 1 U Metal receiver, Removable BNC antennas, XLR- and jack output, Audio status LED's, Frequency range: Q25 (742 - 766 MHz), Includes rack mount kit