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.
Microcurrent is approved in the category of TENS devices by the FDA. TENS devices deliver milliamp current and block pain messages that are tying to get up the spine to the brain. Microcurrent delivers subsensory microamperage current, 1000 times less than milli-amperage current, which has been shown in published studies to increase ATP production in tissues.
Ultra sound creates ultrasonic vibrations and creates heat by vibrating the water molecules in the tissue. It does not provide current nor does it change ATP status. It provides beneficial results by these mechanisms but it is just completely different than microcurrent.