The HNC 905nm laser therapy device is for treating nail fungal infections. It combines pulse laser radiation and blue light energy. 

Laser irradiation will penetrate the infected nail plate and will target causative pathogens residing on the nail bed. 

As a result, the infection will be greatly alleviated and gradually eliminated. 

Lasers produce coherent light energy of sufficient strength and a specific wavelength projected into tissue differentially absorbed by the target material, producing heat and tissue destruction.