our machine can used on cosmetologist, spa, clinics, salon, skin center and so on, and give you traning and one year warranty after service. laser can stimulate the dermal collagen growth while skin treatment, increase epidermal thicknes and density. porphyrin inside of the vessel absorb the 980nm 980nm laser and it caused the blood vessel coagulation and then it disappear, laser won't damage the skin at all. during the treatment, it can also stimulate the collagen of the skin to regrowth and increase skin thickness and density. laser can stimulate the dermal collagen growth while skin treatment, increase epidermal thickness and density.syi