This Q-switched ND:YAG Laser impact and heating,then pigments tissue high speed expansion, broken into tiny particle, these tiny particle can be phagocytosis and absorption by macrophage of human body. It is called “Selectively Thermal Absorption of Laser” Mermaid Q-switch ND YAG Laser facilitates various treatments of tattoo and pigmented lesions removal, laser toning and so on.