The full range of electromagnetic radiation organized by frequency and wavelength. It spans from extremely low frequency (ELF) radio waves through microwaves, infrared, visible light, ultraviolet, X-rays, and gamma rays. PEMF devices operate at the very low end of this spectrum, typically between 1 and 100 Hz. That's well below the frequencies associated with ionizing radiation. These extremely low frequencies are non-thermal and non-ionizing. They don't heat tissue or break molecular bonds.
PEMF sits at the extremely-low-frequency end of the electromagnetic spectrum, pulsing a handful to a few thousand times per second. That is far below radio, and far, far below visible light. At these low frequencies the body barely absorbs the field, which is why reach is set by geometry, not by tissue.
