VECTTOR Therapy is a form of electro-stimulation based upon acupuncture, reflexology, physiology, cellular physiology, and anatomy designed to stimulate the nerves to produce certain neuropeptides essential for optimal functioning of the body. These neuropeptides are vital for increasing circulation to the skin, bones nerves, muscles, and for reducing oxidative stress. The VECTTOR system is designed to read feedback from the body via skin surface temperatures, throughout the treatment process.

While the treatment is running, VECTTOR is constantly monitoring the skin surface temperature looking for an increase in temperature indicating an increase in circulation. VECTTOR runs through a series of frequencies, looking for an increase in skin surface temperature of at least 1 degree Fahrenheit. Once VECTTOR determines which of the various frequencies created the best response, it will automatically run that frequency for the duration of the treatment.

Throughout the treatment and testing phase temperatures are being recorded to the SD card which can later be reviewed by the physician. 

This article gives a good explanation of the effects of electro-stim on the production of neuropeptides:

Acupuncture: neuropeptide release produced by electrical stimulation