Wireless devices – Samsung t139 User Manual
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Health and Safety Information 99
injury or even death. Users are advised to switch the mobile 
device off while at a refueling point (service station). 
Users are reminded of the need to observe restrictions on the use 
of radio equipment in fuel depots (fuel storage and distribution 
areas), chemical plants, or where blasting operations are in 
progress. Areas with a potentially explosive atmosphere are 
often, but not always, clearly marked. They include below deck 
on boats, chemical transfer or storage facilities, vehicles using 
liquefied petroleum gas (such as propane or butane), areas 
where the air contains chemicals or particles, such as grain, 
dust, or metal powders, and any other area where you would 
normally be advised to turn off your vehicle engine.
When your Device is Wet
Do not turn on your device if it is wet. If your device is already on, 
turn it off and remove the battery immediately (if the device will 
not turn off or you cannot remove the battery, leave it as-is). 
Then, dry the device with a towel and take it to a service center.
FCC Hearing Aid Compatibility (HAC)
Regulations for Wireless Devices
The U.S. Federal Communications Commission (FCC) has 
established requirements for digital wireless mobile devices to be 
compatible with hearing aids and other assistive hearing devices.
When individuals employing some assistive hearing devices 
(hearing aids and cochlear implants) use wireless mobile 
devices, they may detect a buzzing, humming, or whining noise. 
Some hearing devices are more immune than others to this 
interference noise, and mobile devices also vary in the amount of 
interference they generate.
The wireless telephone industry has developed a rating system 
for wireless mobile devices to assist hearing device users find 
mobile devices that may be compatible with their hearing 
devices. Not all mobile devices have been rated. Mobile devices 
that are rated have the rating on their box or a label located on 
the box.
The ratings are not guarantees. Results will vary depending on 
the user's hearing device and hearing loss. If your hearing device 
happens to be vulnerable to interference, you may not be able to 
use a rated mobile device successfully. Trying out the mobile 
device with your hearing device is the best way to evaluate it for 
your personal needs.
M-Ratings
: Wireless mobile devices rated M3 or M4 meet FCC
requirements and are likely to generate less interference to 
hearing devices than mobile devices that are not labeled. M4 is 
the better/higher of the two ratings. M-ratings refer to enabling 
acoustic coupling with hearing aids that do not operate in telecoil 
mode.
T-Ratings
: Mobile devices rated T3 or T4 meet FCC requirements
and are likely to generate less interference to hearing devices