Etherdyne’s magnetic resonance wireless power technology is designed to safely operate around humans and not interfere with other technologies.

ETI’s magnetic resonance wireless power systems generate magnetic fields which oscillate at 6.78MHz. Electromagnetic fields at the frequency of 6.78MHz are categorized as non-ionizing electromagnetic radiation.

ETI uses magnetic fields that are 1/5 the strength of Earth’s and operates at frequencies 300 times lower than WiFi and Bluetooth.

ETI’s magnetic resonance technology has been independently tested by UL and BACL and passed FCC §1.1310 Specific Absorption Rate (SAR) limits for the general population.

Regarding interference with other devices, ETI’s technology has passed CE and FCC Part 18 certifications.

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ETI’s loop generates a resonating magnetic field which oscillates at exactly 6.78 MHz. Only a receiver tuned very precisely to the same frequency will receive any meaningful power. This creates a safe failure mode for anything not intentionally tuned to 6.78 MHz from receiving power. A metallic object like a key or coin will not absorb any significant power from ETI’s magnetic fields and has no danger of overheating.

Following consumer product safety guidelines, we designed our system to produce no more than 47C degree of product surface temperature. In our lab (room temperature at 23C degree), the product surface temperature reaches a maximum of 45C degree.

6.78 MHz was chosen as it is the lowest frequency of the ISM bands (Industrial Scientific and Medical).

Magnetic fields interact with human tissue by inducing currents which are proportional to the frequency. Due to the low frequency, the human body is nearly transparent to ETI’s magnetic fields, which are over 300 times lower in frequency than WiFi or Bluetooth.

The strength of ETI’s magnetic fields is 200 milli-Gauss (20 micro-Tesla) at a distance of 4cm (1.5in) from the wire, and falls rapidly with distance. In most of the power zone, the field is below 100 milli-Gauss (10 micro-Tesla).

To give a sense of scale, the Earth’s magnetic field is on average 500 milli-Gauss (50 micro- Tesla) and a common fridge magnet is 200 times stronger, at 100 Gauss.

Studies show that magnetic fields similar in strength and frequency to those used by ETI should not affect pacemakers.

Two relevant studies include:

Smith and Aasen from VoA in 1992 claims that pacemakers have filters that block electromagnetic fields with frequencies between 1kHz and 300MHz. This range includes of 6.78MHz. They also claim a magnetic field strength of 10 Gauss is needed to have an effect on pace makers, this is 50 times greater than field strengths generated by the ETI’s loop.

Nunzio et al. at Imperial College London in 2019 describes both simulations and experimental tests of the effects on a pacemaker by a 6.78MHz inductive wireless power transfer system. The wireless power transmitter coil carried 16A of RF current and was transferring 100W of RF power. Nunzio et al. found no adverse effects on the pacemaker when placed within 12cm of the transmitter coil. For comparison, ETI’s loop only carries 4.2A of RF current.

While the Smith and Nunzio studies suggest that magnetic fields similar in strength and frequency to those used by ETI should not affect pacemakers, ETI’s systems have not been tested with or certified for use with pacemakers or other implanted medical devices. We therefore advise users with pacemakers or other implanted electronic devices to consult their doctors and device manufacturers before exposing themselves to electromagnetic fields from our systems.