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50mw 650nm Wave Portable Tens Unit Stimulator Laser Therapy Acupuncture Pen Features: AK-2000-C is our Latest upgrading version of our acupuncture pen. Is a combination of a acupuncture pen and a laser therapy device. With a built-in laser therapy head and a external therapy head. The Output power for laser therapy head is 50mw, wave length 650nm. 1> The built-in laser therapy head is on the Spheroidal cap, the built-in therapy head is suggested to be used for irradiating the