A Report on Non-Ionizing Radiation

SARs for Apple Watch 3 Released

Highest SAR When Watch Is Held Next to the Head

September 22, 2017

Apple has released the RF exposure numbers —SARs, or specific absorption rates— for its new Series 3 Watches. These are the first wristwatches that can connect to cellular networks without being tethered to an iPhone.

The highest exposures, according to Apple, occur when the new watches are placed next to the head. The SAR measurements are based on a 10mm separation distance. The Model A1860 entails the highest exposure: 0.53 W/Kg averaged over 1g of tissue (0.52 W/Kg for the A1861).

The highest SAR on the wrist is 0.34 W/Kg for the A1861 (0.18 for the A1860). These SARs are measured without any separation from the wrist. Note that the SARs measured for the wrist are averaged over 10g of tissue.           

The basic FCC SAR limit is pegged at 1.6 WKg averaged over 1g of tissue. Many European countries follow the ICNIRP guideline of 2.0 W/Kg averaged over 10g.

Averaging over the smaller volume (1g instead of 10g) can double or triple the maximum SAR (see MWN, J/A00, p.8, S/O01, p.10, and M/J03, p.4).

Here are the preamble and the SAR numbers that Apple posted on its Web site earlier today.

Apple Watch 3: SAR intro

 Apple Wtch A1860Apple Watch A1861Apple Watch A1858Apple Watch A1859

Apple has posted the SARs for its watches, phones and other products here.