... may do wrong operation.As well, no factory could guarantee 100% perfect of the equipment , so if some problem happened, ... as service. 1. Principle:Q-Switched Nd:YAG Laser system,with the advanced laser technology, could make the skin selectively absorbing certain wavelength ... , coffee spot, freckle, senile plaque, pigment from outside injure, black, blue tattoo, eye line, eye brown and lip line etc.2 ...