Shure QLXD2/SM58 H51, Shure QLXD2 / SM58 H51, Digital UHF handheld transmitter with dynamic SM58 capsule, Audio signal: 24 bit / 48 KHz, AES-256 encryption for a secure transmission, Up to 72 MHz switching bandwidth, 22 compatible channels in an 8 MHz TV band, Switchable transmission power: 1/10 mW, 120 dB dynamic range, Metal handheld transmitter with dynamic SM58 microphone capsule, Directional characteristic: Cardioid, Frequency transmission is via infrared interface, Transmitter operates with 1.5 V AA batteries, Can also operate with an SB 900 lithium-ion battery, Frequency band: H51 (534 - 598 MHz), Includes case and microphone holder