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The 4780B from Cyrex is a Diva handsfree color monitor, Black color case, Simple Bus 2. Color Monitor with 3.5" high resolution LCD. Made of ABS plastic with aluminium facia, fitted with brightness, call volume adjustment, door-opening pushbutton, a voice activation pushbutton provided with LED and 1 pushbutton for the "privacy" function provided with LED. This LED has dual functions one for privacy and the other to indicate the simplex speech mode. There are also 3 free pushbuttons (N.O.) for various services. It can be converted into the desk version by adding art. 4782.