led therapy: 1.3 types of specific light source 2.non-risk of burning 3.large treatment area 4.no special ... .Three types of specific light source for clinical treatment; 2.non-risk of burning with Safe optical technology; 3.large treatment ... to use, no need of professional personnel; 7.comfortable, painless, non-invasive and no downtime; 8.stable and continuous work; no any ...