User manual

than phones that are not labeled. T4 is the better/ higher of the two ratings.

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 example illustrated above, 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’s

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.

When you're talking on a cell phone, it's recommended that you turn the BT (Bluetooth) mode off for HAC.

For information about hearing aids and digital wireless phones

Wireless Phones and Hearing Aid Accessibility

http://www.accesswireless.org/Home.aspx

FCC Hearing Aid Compatibility and Volume Control

http://www.fcc.gov/cgb/consumerfacts/hac_wireless.htm

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