The PMT 120 uses 2 square waves simultaneously to carry the magnetic field directly to the cell at up to 20,000 gauss. What does that mean to you? Simple. Instead of resonating just the receptors on the cell membrane, the PMT 120 delivers harmonic impulses that resonates the entire cell membrane. This allows shorter treatments to achieve greater results. The lower intensity units called “Hummers” are not typically felt and can take extended periods to yield results, if any. The powerful PMT 120, a “Ringer” unit, will often produce results in the very first session.