Why do some hand switchs need to set multiple gears?

Recently, a customer asked why some hand switchs should be set with multiple gears? Let me tell you in detail:
Several types of exposure hand brakes are manufactured by Newheek.
Our company mainly produces wired exposure hand brakes with the following models: LO1, LO2, LO3, LO4, LO5, LO6. Among them, LO1, LO2, and LO4 are two-stage exposure handbrake switches, LO3 is a three-stage exposure handbrake switch, and LO5 and LO6 are one-stage exposure handbrake switches.
So why should the exposure handbrake be set to two gears?
1. The first gear is for pre-exposure, false triggering, and reducing X-ray damage to the human body.
The second gear is exposure, which has a prompt function
If there are three gears, it is connected to the beam light device or other purposes.
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