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How would you design an alarm clock for people who are deaf and blind at the same time?
I proposed using water sprinklers or a bed that elevates the upper part to wake up its user
that's a good answer but there are some previous question that must be asked to extract the most information available. questions like: target age? what about people living those people? how they are going to set the alarm, etc. in other word don't assume anything
a vibrating alarm device creating a strong sensation to alert the person since their other sensory organs are sharper