The earliest robot vacuums cleaned until they hit a wall, turned and started zooming in the opposite direction. But, as the technology advanced, the bots gained "sight" and the ability to clean in an organized pattern. That capability is finally trickling down to the budget-priced options with the iRobot Roomba Combo Essential.
Source : https://www.pocket-lint.com/irobot-roomba-combo-essential-review/
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