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What Makes a Robot Vacuum Cleaner Best? The best robot vacuums come with a powerful motors and a set of bristles or rollers that are tough. They also have decently sized dustbins and large battery life. Certain models use smart mapping to create maps of homes. They can be able to pause, recharge and resume cleaning right where they started. They can even create no-go zones and recognize different surfaces. Object Avoidance Object detection is a key feature for robot vacuums since it allows them avoid getting into small objects such as cords, toys, socks, or shoes