The Healy Coil is an add-on device that is plugged into the Healy instead of the electrode cables. When current from the Healy IMF programs flows through the Healy Coil, two opposing magnetic fields are generated. Coils that are based on the principle of Quantum Potential Frequencies (QPF) have been widely used in recent years. They are also an ideal medium for cable-free transmission of Individualized Microcurrent Frequency (IMF) Healy programs into the Bioenergetic Field (BEF)! The Healy Coil is a complement to, rather than a substitute for, the cable electrodes: Cable electrodes are used both for influencing the Bioenergetic Field & for applying microcurrent to the physical body; whereas the Healy Coil can only be used for Healy IMF programs. How the Healy Coil Works: The Principle: Quantum Potential Frequencies (QPF) The genius inventor & physicist Nikola Tesla is widely known for inventing the AC or alternating current system, among other things. He spent a large part of his creativity & time with experiments demonstrating that under perfect resonance, lossless wireless transmission of energy & information over long distances is possible. From the results, he concluded the existence of a hitherto unknown type of waves. Used only a couple of times! Please see reason on Healy Resonance Edition listing. **All items are photographed prior to shipping for both the buyer and sellers protection**