Shure SLXD1 H56, Digital UHF Pocket Transmitter from The SLXD Series, Frequency range: 518 - 562 MHz, 24 Bit / 48 kHz audio conversion, 120 dB dynamic range, TA4M connection, Switchable transmission power: 1 mW / 10 mW, 44 MHz switching bandwidth, External charging contacts, Operation time: Up to 8 hours, Can also operate on Li-Ion battery SB903 (not included), Dimensions (H x W x D): 98 x 68 x 26 mm, Weight: 89 g, Includes storage bag and 2x AA batteries