34 NEXUS 4 QUICK START GUIDE
NEXUS 4 QUICK START GUIDE 35
Set the volume in a quiet environment and select the lowest
volume at which you can hear adequately.
When using headphones, turn the volume down if you cannot
hear the people speaking near you or if the person sitting next
to you can hear what you are listening to.
Do not turn the volume up to block out noisy surroundings.
If you choose to listen to your portable device in a noisy
environment, use noise-cancelling headphones to block out
background environmental noise.
Limit the amount of time you listen. As the volume increases,
less time is required before your hearing could be affected.
Avoid using headphones after exposure to extremely loud
noises, such as rock concerts, that might cause temporary
hearing loss. Temporary hearing loss might cause unsafe
volumes to sound normal.
Do not listen at any volume that causes you discomfort. If
you experience ringing in your ears, hear mu ed speech or
experience any temporary hearing diculty after listening to
your portable audio device, discontinue use and consult your
doctor.
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FDA Consumer Update
The U.S. Food and Drug Administration Centre for Devices and
Radiological Health Consumer Update on Mobile Phones.
1. Do wireless phones pose a health hazard?
The available scientic evidence does not show that any health
problems are associated with using wireless phones. There is no
proof, however, that wireless phones are absolutely safe. Wireless
phones emit low levels of radio frequency energy (RF) in the
microwave range while being used. They also emit very low levels
of RF when in the standby mode. Whereas high levels of RF can
produce health effects (by heating tissue), exposure to low level RF
that does not produce heating effects causes no known adverse
health effects. Many studies of low level RF exposures have not
found any biological effects. Some studies have suggested that
some biological effects may occur, but such ndings have not been
conrmed by additional research. In some cases, other researchers
have had diculty in reproducing those studies, or in determining
the reasons for inconsistent results.
2. What is the FDA’s role concerning the safety of wireless phones?
Under the law, the FDA does not review the safety of radiation
emitting consumer products such as wireless phones before
they can be sold, as it does with new drugs or medical devices.
However, the agency has authority to take action if wireless
phones are shown to emit radio frequency energy (RF) at a level
that is hazardous to the user. In such a case, the FDA could require
the manufacturers of wireless phones to notify users of the health
hazard and to repair, replace, or recall the phones so that the
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