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Metal Electronic Hand Held Meridian Acupuncture Pen 650nm laser Principle 1) Electronic impulse theory 2) Massage therapy theory 3) Biological laser therapy theory Product introduction: Laser therapy Acupuncture pen is a high tech electronic product researched and developed according to meridians theory of Chinese medicine,low frequency impulse theory and laser therapy theory.It can automatically detect and treat acupuncture points by electronic impulse and laser irradiation