There have been many tests over the years using RF energy at the same frequency, 2.45 gigahertz (GHz or billion cycles per second), at which the Apple Watch operates. They are designed to protect against all known adverse effects of RF energy. RF exposure limits in the United States are similar to major international safety limits. Both transmitters meet US SAR limits by a very large factor, and the SAR test results are far below those from cellular phones. The device has two low-powered radios built into it, one for Wi-Fi and one for Bluetooth. I looked up the FCC test data for the Apple Watch Series 3. The tests measure the specific absorption rate (SAR), in a manner similar to that used for cell phone handsets. Instead, regulatory agencies-for example, the US Federal Communications Commission (FCC)-require smartwatches and all other devices that emit RF energy to be tested to verify that they meet US safety limits. The many studies that have been done in search of possible health effects from cell phones have used specialized equipment-not cell phones themselves-to produce the exposures. They would also be very difficult to do in any meaningful way because of the difficulty of controlling exposure. Doing such tests, even with animals, would be very expensive and time consuming. To my knowledge, nobody has tested smartwatches for possible health effects from the radiofrequency (RF) signals that they emit.
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