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fixed point operation: mainly from the bridge of the nose and the corner of the eye, from the inside out, pay attention to avoid the eye hold for 4 seconds when moving to a position, press the start button, and move to the new position after the energy output of the first round is completed. the instrument has two buttons, the button above energy adjustment button,three stalls, a default boot file (first lamp lit), press the button changes to second gear (two lights lit), press the third gear (three lights lit), press the back of a file again. from low number with the operation. use the operating practices, there are two, one is designated operating practices, and second mobile lifting techniques.syi