... PI TO P10, P1 to P9 is dissolving or suck fat, P10 is skin tighten . For the plates,it with function of dissolving ... When we must use the vacuum system ( with the light or without the light and what is the function of the light )?Regarding the parts of body with ... and suck fat. The light it is the LED light, The function is mainly for skin nursing. For this working head, it is just need shift, ...