Shure SLXD2/Beta58 L56, Digital UHF Hand-Held Transmitter, Frequency range: 650 - 694 MHz, With dynamic Beta58A microphone capsule, Microphone polar pattern: Supercardioid, Microphone frequency range: 50 - 16000 Hz, Peak SPL: 140.5 dB, 24 Bit / 48 kHz audio transmission, 120 dB dynamic range, 44 MHz switching bandwidth, Switchable transmission power: 1 mW / 10 mW, External charging contacts, Transmitter operates on 1.5V AA batteries, optionally also with Li-Ion battery SB903 (not included), Includes microphone clamp, storage bag and 2x AA batteries