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‘Dual Bell’ is a very simple concept for door bells -which has two buttons, one for the friends & family and one for Others. Both have different ringtone, So the moment you hear the bell sound you can prepare yourself and your house accordingly.
This will also decrease that conscious stage between you hearing the ringtone and proceeding to next step for identification. ''A very simple but effective change in door bells''.
DSK international school of design
ISD Rubika, Dsk International Campus,Pune India