Sennheiser ew 100 G4-CI1 GB-Band, UHF Wireless System, With SK 100 G4 bodypack transmitter and Ci1 instrument cable, Frequency range: GB-band (606 - 648 MHz), Includes rackmount, Ci1 cable, RJ10 connection cable, NT2-UK power supply and 2x AA batteries@+*Features of EM 100 G4 9.5"" receiver:*@+@+, 42 MHz bandwidth, 20 Frequency banks with up to 12 presets for each, Up to 20 compatible channels, Fast frequency allocation for up to 12 recipients via link function with RJ10 connection, Frequency response: 25 - 18,000 Hz, Frequency transmission via infrared interface, Bodypack with charging contacts for optional battery BA 2015 (NiMH), Pilot tone, Autotune to find free frequencies, Integrated EQ, Built-in tuner, Audio gain over 60 dB range, Soundcheck mode, 4-Level battery indicator on transmitter and receiver, HDX compander, LCD with AF level and channel display, 30 mW transmitter power, 2 BNC antenna connectors, XLR male balanced and jack unbalanced, Power supply 10.5 - 16 V DC