Shure BLX4R T11, UHF Rack Receiver, From the BLX series, Up to 3 systems simultaneously, Pilot tone, Microprocessor controlled antenna diversity, Quick scan feature to find free frequencies, 9.5 ""1U Metal receiver, Removable BNC antennas, XLR- and jack outputs, Audio status LED's, Frequency range: T11 (863 - 865 MHz), Incl. Rack mount kit