Shure ULXD 1 G51, digital UHF pocket transmitter, 24bit/48kHz, Shure Gain Ranging and Input attenuator, switchable HF power: 1mW, 10 mW, 20mW, charging contacts, incl. antenna, box and 2 x AA-Batterien, optional Li-Ion rechargeable battery SB900, frequency range G51 (470 - 534 Mhz)