Dual - representative interface is suitable for user - customized embedded installation solutions. It allows multiple functions to be added to meet the needs of the conference chairman and delegates. These features include facilities for connecting voting panels (with or without card readers) (dcn-fvcrd and dcn-fv). In addition, two separate audio inputs are provided that can be used simultaneously for line input. Each route input can be assigned its own seat number so that dcn-ddi can be used by two representative seats. By setting up, the double representative interface can be used as a single representative machine, a double representative machine, a chairman machine, a presence/exit device or a microphone in the meeting hall. The microphone in the venue environment is located in the venue. When no other representative or chairman microphone is active, it will open automatically. By this method, the interpreter can always keep a voice link with the venue. Basic function, when open the corresponding input, the speaker output will be closed, the device can be mounted on the surface of the table independently, installed on the wall, or finely embedded into the desktop or seat armrest. With microphone connection panel (DCN - FMIC) and the microphone control panel (DCNFMICB), the device can be used for handheld microphone (DCN - FHH) or pluggable microphone (DCN - MICS, DCN - MICL), in addition, the device also provides an interface to connect to LBB 3555/00 talkback machine. Control and three lights, each input switch, is used to perform the following functions: - microphone or route choice - non-equilibrium microphone input, balanced mic/line input, or magic like the balance of power selection microphone input - each input connection can choose a variety of input attenuation: 0, 6, 12 and 18 dB + / - 3 dB input level fine-tuning potentiometer, remote control input (switch) and output (LED), match the DCN receiver and the control panel, is used to select different DCN - DDI mode switch: - on behalf of the President of the -, double - double representative, representatives of a microphone - double, mute the speaker - single representative - attend/out - the venue environment annotations to use phone to attend/exclusionary pattern, also must have a PC control software. Interconnected components, two RJ11 connector, used to connect to DCN ‑ FMICB microphone control surface plate, DCN ‑ FPRIOB priority panels, DCN - FV voting panels and DCN ‑ FVCRD vote and card panel, an RJ11 connector, used to connect to LBB 3555/00 interphone, two way balanced audio input, Used to connect circuit (0 dB) or has/have no illusion power receiver (60 dB) signal source (two eight needle 262 ° DIN plug hole), six stitches circular connector, used for loop system wiring, 2 meters (78.7 inches) cable, end with a molded six stitches circular connector, provide two 3.5 mm (0.14 inch) stereo jack, used to connect the ear machine or speakers panel (DCN ‑ FLSP).