The Feedback Loop is just a narrower coil, a smaller diameter coil, and we found that the energy flowing through the Feedback Loop is a higher velocity. If this standard sized coil has a flow like a garden hose, then this Feedback Loop would be more like a high pressure car wash – a narrower beam, and it would draw energy from, say, a point here in my hand, and feed it back directly into that point. That’s what we call phase conjugate mirroring. So we’re pulling out energy at a certain frequency and then returning that same energy at 180 degrees out of phase.  What this does is cancel the original frequency. So it goes to zero. If you have a frequency causing pain, this would cancel that frequency at the source and consequently eliminate the pain. So it’s just a different version of the coil and can be used as a stand-alone, or it can be used in combination with the Acu-Vac Coil and/or the rings.