These are the plain form of the voice based display but will instead give a loud ding dong bell when operated .these also come in various models and can be built from 2 digits upto 8 digits or more as per the need. Here we have add a few special features like we can also operate a number of display units from a single base /input unit or can have a lot of base units showing all the matter on a single display placed in a central location.
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