SAR Information

On June 1, 2002, a law was enacted that establishes a new system*1 for radio wave emissions by wireless mobile phones. It sets a local exposure limit to radio frequency energy for certain parts of the human body (mainly the head). It employs a unit of measurement known as the Specific Absorption Rate (SAR)*2. The maximum value for this limit is set at 2 W/kg. With the enactment of this law, a variety of new standard values and a new measurement method*3 have been defined. Through our website, The DOCOMO is making available to anyone interested the SAR values measured for all our handsets and the SAR values measured abroad for all our international roaming handsets. This information is being provided in order to...

• Help the public better understand the intent of the law.
• Assure the public of the safety of our mobile phones.

*1 Determined by regulations for enforcing the Radio Law.

*2 Specific Absorption Rate (SAR):
The electrical power absorbed by the unit mass of the human body as a result of exposure to an electromagnetic field. Whole-body SAR averages SAR over whole body, while partial-body SAR averages SAR of any 1g or 10g tissues of the human body.

*3 Clarification of standard values and measurement methods:
A variety of measurement methods were proposed in the past. The local SAR measurement method for the head was finally standardized. This method was established based on recommendations from standardization organizations around the world including Japan.