1 nutrients absorb; 2.skin metabolism; 3.maintain skin elasticity; 4.break down fat cell. cold and hammer relieve pain, shrink pores, calm inflammation, reduce redness, open pores, accelerate blood circulation, enhance metabolism, transit nutrient. it use the ultrasonic waves to shake loose dead skin cells it also create heat and vibration to give a pleasant massage which will drive creams and ampoules into the skin. pn therapy, using intense pulsed light 630-120nm , and direct exposure to skin table surface, it can penetrate into the skin depth, selective effect on the skin pigmentation,blood vessels etc. different color has different function.for example: red for promote blood circulation..syi