Not every robot vacuum has a brush roll

Brush rolls flick dirt loose from carpets. Simple concept, but not every robot vacuum has one. Models that do: iRobot Roomba 694, Roborock S7 MaxV Ultra, Eufy RoboVac X8 Hybrid, Shark AI Self-Empty XL, Dreame Bot. If you have carpets, check before you buy. A brushless vac on carpet is basically a dust shuffler.