GLENSOUND GSGC4 Dual APTX & G722 codec This reporter unit comes with an ISDN lead, original power lead, Sennheiser headphones, user manual and the original hard-shelled plastic case. It’s in fully working order. The GSGC4 audio section consists of a 1 mic + 1 line input mixer, with a single headphone monitor output, with its own mix of desk output and cue return. This section can be used with conventional landlines. On the ISDN section, calls may be made utilising internal codecs via an approved integral terminal adapter. All audio inputs and outputs are via front panel mounted XLRs, with headphone jacks. 21 interface on’D’ connector, external DC input and power switching are on the rear. A sloping top panel contains sensibly arranged user controls separated into two logical sections, audio control and call set-up/configure control. Basic operating instructions in English are also clearly printed on the control panel. Audio controls include 4 channel rotary pots, two sets of headphone controls and a basic LED column PPM. Internally, a compressor limiter is inserted after the PPM. The keyboard allows dialling and a number of configuration options. Including selection of incoming/outgoing B channel, memory dialling, sub-address mode and multiple subscriber numbering mode. Units can operate on internal alkaline batteries (3 × D size) for over 8 hours or from an external 6-9VDC source with 500mA capacity. They are supplied in a polypropylene transit case.