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ultrasonic waves refer to waves with frequencies stands for micro focused high ultra ultrasound and can generate thermal effect in human tissues by focusing high intensity ultrasound on one point. it was originally used to destroy tumors and cancer cells without incision, but nowadays it is also applied to elasticity lifting equipment. elasticity lifting procedures irradiate strong ultrasound energy inside the skin and generate heat to cause coagulation, in which tissues contract, pulling the skin together, and proceed to go through internal recovery which generates collagen to help improve skin elasticity and wrinkle improvement.syi