The microphone desk incorporates an internal preamplifier that provides an output level of 0 dBm, suitable for connecting directly to the public address power units. The -60 dBm output is also available to connect to the microphone inputs of any audio amplifier. For general call. It incorporates the power supply. Selectable output level between microphone (-60 dB) or 0 dB. 35 cm gooseneck microphone. Talk / Gong / Busy indicators. Call button with gong. Call button without gong. Microphone volume adjustment. Gong volume adjustment. Gain selectors and configuration microswitches.