Dumb as a cork! By what principle the vacuum cleaner moves is not clear at all! He can clean the floor of the hall, go to the kitchen, not completely clean it, but go to the room. From the room they will return to the hall, spin in one place and leave for the corridor! Garbage doesn't seem to be picking up badly. Hits all corners! I took for 19800. It is better to look for a better model.