INTRODUCTION
The laser of 808nm can penetrate deep to the pain area, about 5-7 cm, so to treat arthritis, knee, shoulder pain, etc. the laser of 650nm can penetrate shallow skin (2-3cm) likevessel wall, to relief the shallow pain and wound healing. Laser therapy delivers non-thermal photons of light to the body for about 3 to 8 minutes by the injured cells. The cells are then stimulated and respond with a higher rate of metabolism. It results in relief from pain, better circulation, Hand Held Laser Brochure(2)
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