, more effective, less painful, general purpose. 2, the choice of many beauty salons. 3, wide coverage, can scrape all back at once. 4, the groove bending amplitude is more suitable for the human body curve. Different lengths correspond to different parts, and the relevance is stronger. 5, special concave and convex, concave health, convex out. Instructions 1) for the back: First use the concave surface from top to bottom, each time in the same direction. Then use the convex surface to scrape the spine. 2) for the abdomen: Take the navel as the center, massage from top to bottom, the intensity is even, not too much force, ruddy is very good. Generally adhere to three days to a week, constipation can be improved. 3) for the legs: from the knee, down, only in the same direction each time (if there are varicose veins or edema in the lower extremities, you must go from bottom to top blood circulation) 4) for the shoulder and neck: From top to bottom, the action frequency should be slow and consistent, not too fast, the force should not be too heavy. The gentle movement can help the flow of lymph, relieve the lack of blood flow to the head, shoulder and neck obstruction, etc. problem. each place is 3-5 minutes.