Samsung SGH-S959ZKATFN - Manual (Page 202)

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Under the standard, this should provide the hearing aid user with
normal use while using the hearing aid with the particular
wireless mobile device. A sum of 6 or more would indicate
excellent performance.
However, these are not guarantees that all users will be satisfied.
T ratings work similarly.
The HAC rating and measurement procedure are described in the
American National Standards Institute (ANSI) C63.19 standard.
HAC for Newer Technologies
This phone has been tested and rated for use with hearing aids
for some of the wireless technologies that it uses. However, there
may be some newer wireless technologies used in this phone
that have not been tested yet for use with hearing aids.
It is important to try the different features of this phone
thoroughly and in different locations, using your hearing aid or
cochlear implant, to determine if you hear any interfering noise.
Consult your service provider or the manufacturer of this phone
for information on hearing aid compatibility. If you have questions
about return or exchange policies, consult your service provider
or phone retailer.
Restricting Children's Access to Your Mobile
Device
Your mobile device is not a toy. Do not allow children to play with
it because they could hurt themselves and others, damage the
mobile device, or make calls that increase your mobile device
bill.
Keep the mobile device and all its parts and accessories out of
the reach of small children.
M3 + M2 = 5
T3 + T2 = 5