... depth and possible pigmentation by melanin, so we can acclaim RF is a perfect usage on dermal collagen growth. Firstly ... the collagen shrinks when heat works caused by RF works on collagen fibrous layer, which makes the skin ... , Rejuvenation, Pigmentation, Vascular, Acne , Hair removal.STechnical Parameters:S Spectrum: 560~1200nm (green button) 640~1200nm(yellow button) (430nm,480nm ...