The vacuum cleaner cleans well and quickly. The system is like this: 1. Download the Xiaomi Home App 2. Then the vacuum cleaner examines the room and draws a map 3. Then you divide this map into zones. 4. And after that, you can assign the vacuum cleaner which areas to clean. Then he himself, on command, returns to the charging zone. Comfortable. One attack: The app itself is very, very slow. Takes a long time to load rooms. Doesn't always respond to commands. Judging by the reviews, this is a common problem. But in general - a very convenient thing! :-)