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Smoke alarms designed for deaf people are quite different.
They have several separate parts and produce vibration and a flashing light to wake or alert you. A typical smoke alarm system for deaf people consists of a smoke detector, vibrating pad, flashing strobe light, control box and wire for connecting these parts together. The control box contains the electronic circuit for operating and monitoring the system, and batteries and connections for the vibrating pad and smoke detector. It usually has a built-in strobe light. Most systems use a conventional smoke alarm for detecting smoke so it also emits an audible alarm.