Roborock E4 was able to allay my concerns regarding the effectiveness of equipment of this kind. The traditional cyclonic vacuum cleaner was packed with women's hair to the tune of 70 percent (at home, in addition to the dog, there are two women). In addition, I had a rational fear that the turbo brush would become tangled up with the strands. In point of fact, this is what takes place; nonetheless, for three or four cleanings (I am frequently away of the house), this is plenty, and there is no discernible degradation in either the cleaning quality or the robot itself. According to the robot's measurements, it can clean between 52 and 60 square meters out of a total of 90 square meters, during which time it uses between 68 and 78 minutes and around 32% of its charge. There is no correlation between time and location in a straightforward way.