Xiaomi X20 Max

Suction in pascal, as the maker measures it. More pascal helps on carpet, but it says little about how well the robot picks grit off a hard floor.

The dock empties the robot’s dust bin, usually after every run. You only empty the dock’s bag or bin. On this model: derived from the station type

The dock washes the mop for you, so you do not rinse it by hand. On this model: derived from the station type

The dock dries the mop afterwards, so it does not sit there wet and start to smell. On this model: derived from the station type

Drying is done with warm air instead of cold. It is faster and it helps against smell.

An extending leg or wheel that carries the robot over a high threshold. Without one it usually stops at about 2 cm.

How tall the robot is. It decides whether it fits under your sofa, bed or cabinet.