The manufacturers and distributors of the equipment used in the FSM courses are completely separate from FSM and are not involved in Frequency Specific Seminars or in the teaching of uses of frequencies. The frequencies have to be delivered by some sort of electromagnetic device that supplies current. These devices are categorized as TENS devices and as such are only approved for and used in the treatment of pain. Most of the applications of frequencies are for pain which is consistent with the approved use of the devices. But the effects of biological resonance and frequencies have nothing to do with the devices or their approved uses.