Shure QLXD14/SM35 H51, Digital UHF Wireless System with Pocket transmitter and Headset Microphone, Frequency band: H51 (534 - 598 MHz), Audio signal: 24 Bit / 48 kHz, AES-256 encryption for secure transmissions, Up to 72 MHz in switching bandwidth, 22 Compatible systems in an 8 MHz TV band, Switchable transmitter power: 1/10 mW, 120 dB Dynamic range, Metal pocket transmitter with 4-pin TQG connector, SM35 Condenser headset microphone, Directional characteristic: cardioid, 9.5"" Metal receiver, Detachable BNC antennas, Ethernet connector for monitoring and configuration of the system, Frequency transmission via infrared interface, XLR / Jack output, Operates via 1.5 V AA batteries - also optionally with SB 900 lithium-ion batteries, Includes a PS23 power supply and a rack mount