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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
IC
This device complies with Industry Canada licence-exempt RSS standard(s). Operation is
subject to the following two conditions: (1) this device may not cause interference, and (2) this
device must accept any interference, including interference that may cause undesired
operation of the device.
Changes or modifications not expressly approved by the party responsible for compliance
could void the user's authority to operate the equipment.
Note: Some content and services accessible through this device belong to third parties and are
protected by copyright, patent, trademark and/or other intellectual property laws. Such
content and services are provided solely for your personal noncommercial use. You may not
use any content or services in a manner that has not been authorized by the content owner or
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