Shure QLXD24/Beta87A S50, Digital UHF Wireless System, Handheld metal transmitter with capacitor Beta87A capsule, Characteristic: Supercardioid, 120 dB dynamic range, Audio signal: 24 bit / 48 kHz, AES-256 encryption for tap-proof transmission, Up to 72 MHz switching bandwidth, 22 compatible channels in an 8 MHz TV band, Switchable transmission power 1/10 mW, 9.5"" metal receiver, Detachable BNC antennas, Ethernet port for system monitoring and configuration, Frequency transmission via infrared interface, XLR/jack output, Transmitter operates with either 1.5 V AA batteries, or with (optional) SB 900 lithium ion rechargeable battery, Frequency band: S50 (823 - 832 MHz and 863 - 865 MHz), Includes PS23 power supply and rack mount