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650nm Laser wavelength,Portable Therapy Acupuncture Pen Tens Unit Stimulator 2. Principle and Feature: 2.1. Principle: The yellow Emperor's Canon of Internal Medicine says: "There are 365 acupuncture points on the body which are formed through connection of joints. You will master the essentials if you understand." The joints mainly mean the key acupuncture points on the human body, and the key acupuncture points are regularly distributed on the positions of large joints.