SoftBank 304HW User Manual page 227

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European RF Exposure Information
Your mobile device is a radio transmitter and receiver. It
is designed not to exceed the limits for exposure to radio
waves recommended by international guidelines. These
guidelines were developed by the independent scientific
organization ICNIRP and include safety margins designed to
assure the protection of all persons, regardless of age and
health.
The guidelines use a unit of measurement known as the
Specific Absorption Rate, or SAR. The SAR limit for mobile
devices is 2.0 W/kg and the highest SAR value for this
device when tested on the body is 0.504 W/kg*. As SAR is
measured utilizing the devices highest transmitting power
the actual SAR of this device while operating is typically
below that indicated above. This is due to automatic
changes to the power level of the device to ensure it only
uses the minimum level required to reach the network.
The World Health Organization has stated that present
scientific information does not indicate the need for any
special precautions for the use of mobile devices. They note
that if you want to reduce your exposure then you can do so
by limiting the length of calls or using a hands-free device to
keep the mobile phone away from the head and body.
*Please see Electromagnetic Safety for important notes
regarding body worn operation.
World Health Organization
http://www.who.int/emf
List of Specific Absorption Rates (SAR) for radio waves
http://mb.softbank.jp/mb/support/sar/ (Japanese)