Sennheiser ew 300 G4 Base SK-RC GBW Band, UHF Wireless System, Includes the SK 300 G4-RC with remote control and the EM 300-500 G4 9.5"" receiver, Frequency range: GBW Band (606 - 678 MHz), 75 MHz Switching bandwidth, 20 Channel banks with up to 32 presets each, Up to 32 compatible channels, Network connection for frequency management and control via software WSM (Wireless System Manager), Frequency response: 25 - 18,000 Hz, Frequency transmission via infrared interface, Pocket transmitter with charging contacts for an optional BA 2015 battery (NiMH), Pilot tone, Automatic frequency scan feature locates available frequencies, Integrated EQ, Audio gain: 60 dB, Soundcheck mode, 4-Digit battery indicator on the transmitter and receiver, HDX compander, LCD display with AF / RF level and channel display, Switchable transmission power: 10 / 30 / 50 mW, 2x BNC antenna sockets, XLR male balanced and jack unbalanced, Power supply: 10.5 - 16 V DC, Includes a GA 3 rackmount, NT2 power supply, and 2x AA batteries