Shure SLXD14DE K59, 2-Channel Digital UHF Wireless System, With 2x SLXD1 pocket transmitters, Frequency range: K59 (606-650 MHz), 24-Bit/48 kHz, 120 dB Dynamic range, 44 MHz Switching bandwidth, Switchable transmission power: 1 mW/10 mW, 12 Compatible channels per 8 MHz band, Frequency transmission via infrared interface, XLR/Jack output, Pocket transmitter with TA4M connection, Transmitter operates with 1.5 V AA batteries, Includes 19'' mounting accessories, Suitable SB903 li-ion battery available under Article Nr #499632# (not included)