Shure QLXD14/85 H51, Digital UHF Wireless System with Pocket Transmitter and Lavalier Microphone, Frequency band H51: 534 - 598 MHz, 24 Bit / 48 kHz audio signal, AES-256 encryption for tap-proof transmission, Up to 72 MHz bandwidth, 22 Compatible channels in an 8 MHz tv band, Switchable transmitter power 1/10mW, 120 dB dynamic range, Metal pocket transmitter with 4-pin TQG connector, WL185 Capacitor lavalier microphone, Directional characteristics: Cardioid, 9.5"" metal receiver, Detachable BNC antennas, Ethernet connection for monitoring and configuration of the system, Frequency transmission over infra red interface, XLR / jack output, Transmitter operates with 1.5 V AA batteries - also available with SB 900 lithium ion battery, Including PS23 power supply and Rackmount