Through the line above the handle, the laser inside the machine is transmitted to the inside of the handle, and the gear position of the laser is adjusted by adjusting the button on the left side of the handle. There are four gears in total. Press the button in front to give out light, which is mainly used for skin treatment. The handle has high requirements for heat dissipation. The fan is built in the upper part, and the tail can be taken out for cleaning separately. The inside is a lens, which plays a role in controlling light refraction.