S.A.R. Levels and our mobile phones


Today, when we want to buy a mobile phone, tablet, wireless music headset… We worry a lot about color, size, design, price… But we forget something very important, the SAR, what is the S.A.R.?

Every mobile device emits an RF (Radio Frequency) at certain levels. Some levels are allowed in the US and others in the European Union. The word SAR stands for “Specific Absorption Rate”, it is a measure of the rate of absorption of RF (radio frequency) energy in the body. That is, the energy emitted by the source that is the object of this measurement – ​​a mobile phone, bluetooth headset…. The SAR provides a clear way to measure the exposure to RF (radio frequency) energy for each device, to verify that they comply with the safety guidelines established by the FCC (Federal Communications Commission). It is the power absorbed by the mass of tissues and has units of watts per kilogram (W/kg). The US requires phones to have a SAR value equal to or less than 1.6 watts per kilogram (W/kg) measured in a volume of 1 gram of tissue, while the EU sets a limit of 2 W/kg, averaged over 10 grams of tissue.

Each mobile device has its measurements and they are specified in their characteristics, which is often difficult to find. Two indications must appear, the exposed value for the body and for the head.

The SAR is a fact that is very little known in our society, being a very important fact. Nowadays, it is very common to carry the mobile phone with us all day in our pockets. Also, for “fear” of something happening, children are bought a smart watch. Children as young as 8 or 9 years old wear a watch with an RF SAR rate “x” during the day for many hours.

All mobile phones must meet the RF energy exposure standards set by the FCC, which are set at levels much lower than those at which harmful effects might occur, based on laboratory experiments and where experts in medicine and biology generally agree. For users who are concerned about whether this standard is indeed adequate, or who for some reason wish to reduce their exposure to RF energy, the most effective way to do so is to hold the cell phone away from the head and body and use a speakerphone. or a hands-free accessory. Generally, these measurements will have a much greater effect on the absorption of RF energy than the small difference in SAR from one cell phone to another, which is in any case not a reliable comparison of consumer exposure to RF energy. given the variables in each person’s usage.


Please enter your comment!
Please enter your name here