... Pain relief Model S-2C Semi-Conductor Laser Therapy System is features by small dimensions, light weight, unnecessary water cool, ... max depth in human body of 630~830mm wave length laser is 5-7cm. When the power is 100mW, the depth ... max. Damage is 20W/cm2, is 20thimes of He-Ne laser). The safety coefficient is very high, It create a new ...