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Hearing devices may also be rated. Your hearing device manufacturer or hearing health professional may help you find this rating.
Higher ratings mean that the hearing device is relatively immune to interference noise. The hearing aid and wireless phone rating values are
then added together. A sum of 5 is considered acceptable for normal use. A sum of 6 is considered for best use.
In the above example, if a hearing aid meets the M2 level rating and the wireless phone meets the M3 level rating, the sum of the two
values equal M5. This should provide the hearing aid user with “normal usage” while using their hearing aid with the particular wireless
phone. “Normal usage” in this context is defined as a signal quality that is acceptable for normal operation.
The M mark is intended to be synonymous with the U mark. The T mark is intended to be synonymous with the UT mark. The M and T
marks are recommended by the Alliance for Telecommunications Industries Solutions (ATIS). The U and UT marks are referenced in
Section 20.19 of the FCC Rules. The HAC rating and measurement procedure are described in the American National Standards Institute
(ANSI) C63.19 standard.
Summary of Contents for VK650C
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