A probe emitting a very precise low current is placed at specific points on the body. The surface of the body differs greatly in its surface conductivity, so points of low resistance are chosen to allow for greater penetration of that low current. It did not state that it was effective enough to recommend it. Results are still coming in. The jury is still out on these items.
Several researchers indicate that there is no effect.
Others will attribute some success to the placebo or the experimentee's desire for success for the researcher. No double blind experiment has yet been published, although there are some in the works. I was fortunate enough to see one of the new Galallian telescopes which have been implanted in the lens cavity and focuses on an undamaged area of the retina. This tricks the retina into thinking that this is the macula now and has been successful in over 900 operations in Israel and Europe. Robots now able to make smaller incisions thus enhance healing.