It is Wireless Fire Alarm System for the hard of hearing people or eldery people.
It detects fire hydrant's fire bell sound of apartment etc. or
smoke detector's sound of separate house etc. and informs the fire's
danger through light/strong vibration to hard of hearing people or elderly people.
So hard of hearing people, who can't hear the sound, can cope with
the danger themselves and can run their safe life.
When daily life, it informs the emergencies through light and
when sleep or light notification's outside scope, it informs the risk of fire through