What are the advantages of the two steps hand switch?

Does the hand switch choose 2 steps? What are the advantages of the 2 gears hand switch ?
At present, many people will choose 2 gears hand switch, 2 gears hand switch have become a better choice for X-ray exposure operation. In fact, the second hand switch is more practical than the first hand switch .
Generally, the first gear is the reserve gear. Pressing the second gear is the exposure completion. The existence of the reserve gear has a better use, that is, it can prevent operator’s mistake touch, especially the radiation of X-ray has harm to human body.
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