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.
Some systems can be expanded to give a wider coverage of your home, for example by adding extra strobe lights and smoke detectors. On some systems, you can also connect an optional alarm clock so that you only need one vibrating pad to give a warning of both fire and clock alarm. To install a smoke alarm system, you must fit the parts of the system into different places in your home and link them together. This can usually be done by anyone with good DIY skills and experience of wiring. The control box contains the connections to the smoke detector.