There are some smoke alarms with strobes or the ability to be used with strobes – also called visible notification appliances – that signal to awaken those that are deaf (those with profound hearing loss.) the use of tactile notification appliances (such as a pillow or bed shaker) is also now required, and activated by the sound of the smoke alarm. The means for signaling to awaken those who are hard of hearing (those with mild to severe hearing loss) is through the use of a complex low frequency audible signal. Smoke alarms currently on the market do not produce this signal. However, separate notification appliances are available that do produce this signal, and are activated by the sound of the smoke alarm.

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