UV light?

I've seen conflicting information and app examples referencing UV light use in some stage of cleaning. I do not have this in my app.
What is the discrepancy?

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It should not be a setting, but rather something that occurs automatically. The UV sterilization is not something onboard the robot, but rather the base station when the robot returns. The base station UV sterilizes the mop pads and the dust bag to reduce bacteria. It also auto drys during this process!

Washing and drying settings are configurable here