Samsung t139 - Manual (Page 104)

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than mobile devices that are not labeled. T4 is the better/higher
of the two ratings. T-ratings refer to enabling inductive coupling
with hearing aids operating in telecoil mode.
Hearing devices may also be rated. Your hearing aid
manufacturer or hearing health professional may help you find
this rating. Higher ratings mean that the hearing device is
relatively immune to interference noise.
Under the current industry standard, American National
Standards Institute (ANSI) C63.19, the hearing aid and wireless
mobile device rating values are added together to indicate how
usable they are together. For example, if a hearing aid meets the
M2 level rating and the wireless mobile device meets the M3
level rating, the sum of the two values equals M5.
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.
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