Shure QLXD2/Beta87c P51, Digital Radio System, Digital UHF handheld transmitter with capacitor Beta87c capsule, 24bit/48 KHz Audio signal, 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, 120 dB Dynamic range, Metal handheld transmitter with dynamic Beta87c microphone capsule, Characteristic: Kidney, Frequency transmission via infrared interface, Frequency band: P51 (710 - 782 MHz), Transmitter operation with 1.5 V AA batteries - optionally also with SB 900 lithium ion rechargeable battery, Includes bag and microphone holder