40k strong sound waves explosion head effectively promote the organization fat metabolism, repel orange peel fat, firming skin,enhancing skin elasticity, etc. And the effect is long lasting. The 40 k sound waves can make a implosion of liquid as the expansion and compression of the wave make the inside of the liquid formed in many small space and what inside this kind of space are gas and steam. During the compression cycle, the 40k sound waves have positive pressure effect on the liquid molecules, while during the expansion cycle the 40k sound waves have positive pressure effect on the liquid molecules. There are cohesion inside of liquid or and biological organization. Inside of the low density fat cells, the cohesiveness of the molecular is weaker.the low negative pressure which is produce by 40 k sound waves will produce organization gap which is called "cavitation phenomenon" inphysics. The implosion of inside and outside of the cells will enhanced the molecular motion and achieve a high energy level, and eventually led to the bursting of the fat cells.