What makes the Roomba j7+ good at avoiding obstacles like phone cords and LEGOs?

The [Roomba j](https://www.amazon.com/s?k=Roomba+j&tag=wehavethat-20)7+ uses camera-based PrecisionVision to recognize obstacles like cords, toys, and pet accidents before bumping into them. You can also set keep-out zones in the app to block off areas like a nursery or playroom.