Spa instrument adopts Gavanic intelligent micro-current and ion exchange import and export principle, that is, like charges attract and opposite charges repel. When cleaning and detoxifying, the conductive headband is negatively charged, and the essence colloid is also negatively charged. Negative repulsion pushes the essence and wraps the charged dirt in the pores. When the nutrition is repaired, the conductive headband is positively charged, and the negative ions previously wrapped in dirt are led out while introducing the nutritional essence. The principle of spa machine and medical beauty instrument is completely different. The former belongs to life beauty, while laser, radio frequency and photon belong to medical beauty. Photons in medical beauty are based on the principle of selective photothermal. Pigments and collagen under the skin absorb light and have the function of removing spots and rejuvenating skin. Radio wave skin lift is a kind of radio frequency, which can promote the thickening of subcutaneous collagen and tighten the skin; Laser is also a selective photothermal principle, and the pigment under the skin absorbs light, so it has the effect of removing spots. No matter how good the Spa machine is, it can not only tighten the face, brighten the complexion, shrink the pores and slim the face, but also whiten and treat dysmenorrhea. It's not everything. General household spa machines with brushes have cleaning effect; Instruments based on the principle of positive and negative electron attraction can help skin care products penetrate the skin barrier, but only small molecules can penetrate the skin barrier and cannot output so-called dirty things; "The so-called dredging lymph, relieving dysmenorrhea, relieving abdomen, preventing gynecological diseases and relieving shoulder and neck fatigue are even more nonsense." Some spa instruments with red and blue light may have certain effects on lupus erythematosus; Those containing radio frequencies may tighten the skin, but these effects are not guaranteed. Because qualified life beauty instruments can only ensure the safety of the human body, but not the effect, "Laser, RF and other instruments need rich clinical data to prove their safety and effectiveness, in order to pass SFDA certification and can only be used in hospitals. If these principles of hospital-level equipment are applied to home Spa machines, the power and parameters of the original equipment will definitely be changed. Without authoritative clinical data verification, the effect cannot be guaranteed.