They rented an apartment of 90 sq. Not cleaned in the hallway and bathroom, as the magnetic field is 350 units, measured by application. In manual mode, it seems to rest against the wall. The forums advise a foil cap on the hall sensor. In other rooms where there is no strong magnet, it cleans perfectly. At first, we lost a lot of time walking and watching how it was removed) I add water and wash the rag before each cleaning. I do not regret that I spent 26,000 (I took a global on Ali)