--a version of the "Rebuilder", one of many neuropathy treatment fads that have come and gone over the years.

It involves the use of vibrating foot baths, usually with magnesium salts, with the idea that the chemical ions will at least somewhat penetrate to the nerves and help to "normalize" the ionic exchanges that underlie nerve signaling.

As I recall, some people reported some improvement with this, some didn't; it seemed to be more effective in those whose foot neuropathy could be traced to ischemic/circulatory issues, as occurs in diabetes and certain vascular autoimmunities.

Here's just one of many websites about it--unfortunately, most of these websites are not major medical research concerns (most are commercial):

The ReBuilder