Mint 4200 sensors and a special tip for mopping more effectively

From iRobot: Mint has smart built-in sensors that help it avoid stairs, area rugs and raised transitions to carpets. It can also detect furniture, including chair and table legs, slowing down while ge

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? what are the special tips?

[@GaryCrowellJr]

At the end of the video, manually help with the mopping of tough spots