7.18  hearing assistance devices/systems (HADS).  A group of instruments intended to facilitate hearing by providing amplification of an acoustic signal and/or improving the signal-to-noise ratio by means of a non-acoustic signal transmission method. HADS include personal assistive listening devices, hearing assistance technologies, auditory trainers, large-area assistive listening systems, telephone amplifiers, alerting devices, and other similar devices and may be hardwired or wireless.

Annotation         See ANSI/ASA S3.47.

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