Shure SLXD14DE S50, 2-Channel Digital UHF Wireless System, With 2x SLXD1 pocket transmitters, Frequency range: S50 (823-832 MHz and 863-865 MHz), 24-Bit / 48 kHz, 120 dB Dynamic range, 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)