Most alarms and warning systems use noise to draw attention. For hearing-impaired people such devices might be of limited use. It is possible to get alarm clocks with flashing lights or vibrating pads which will move inside the pillow.
A doorbell can also be attached to a flashing light. You could also have extension door bells installed in different places in the home.
Smoke alarms have a rather high pitch signal, which may not be able to alert a hearing-impaired person. Today, special alarms have been developed to use both visual and vibrating stimuli to alert the hearing-impaired person.
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