Shure QLXD2/Beta87c H51, Digital UHF Wireless System with Beta87c Microphone Capsule, Frequency band: H51 (534 - 598 MHz), Audio signal: 24 bit/ 48 kHz, AES 256 Encryption for secure transmission, Up to 72 MHz switching bandwidth, 22 Compatible systems per 8 MHz TV channel, Switchable transmitter power 1/ 10 mW, 120 dB Dynamic range, Metal handheld transmitter with beta87c microphone capsule, Polar pattern: Cardioid, Frequency transmission via infrared interface, Transmitter operated with 1.5 V AA batteries - optionally also with SB 900 lithium-ion battery, Incl. case and microphone clip