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When the fire alarm senses the fire broke out, a bracelet that wears on the hand of the hearing-impaired people will receive the information from the fire alarm through the Bluetooth.
The fire alarm will also project an escape route map on the ground and well to guide the users exit the right direction.
The bracelet is easily to buckle it on the user's hand by building an elastic sheet metal inside it. Therefore the elderly, young children, or people with disabilities can wear the bracelet by themselves.