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Hello Watson, The robot knows not to go down stairs because it uses cliff sensors, which are infrared sensors on its underside that detect drop-offs; the infrared light bounces back from flat surfaces, but when it hits empty space (like a stairwell), the signal doesn't return, triggering the Roomba to change direction and avoid falling. These sensors are crucial for preventing accidents and are located around the robot's base, requiring occasional cleaning to stay effective.
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