Shure QLXD4 K51, Digital UHF Receiver, Frequency band: K51 (606 - 670 MHz), 24 bit / 48 kHz audio signal, AES-256 encryption for tap-proof transmission, Up to 72 MHz switching bandwidth, 22 compatible channels in an 8 MHz TV band, 9.5"" housing, Detachable BNC antennas, Ethernet port for system monitoring and configuration, Frequency transmission via infrared interface, XLR / jack output, Includes PS23 power supply, rack mount, antennas and antenna front mounting set for antenna