It is harmful for human body to be hit by laser during the laser cutter engraver is processing, since the laser beam contains powerful energy. In order to avoid this kind of accidents, all the Thunder Laser cutting machine have the flap protection switch on the top flap. If someone opens the top flap when the laser cutting machine is working, the machine would be stop working immediately. Only close the top flap, the laser machine would begin to work again. Using the flap protection guarantees the safety of the operating person.
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