Precautions:
1. Do not touch or wipe the lens. If there is dust, it can be blown with wind.
2. The high power laser should not be placed close to objects to turn on lights, otherwise the light will reflect back to the collimating lens and burn it out.
For example, if you directly place the laser head downwards on the ground while the laser is on, the collimating lens will be directly burned out.
