Roof windows can also be cleaned with it. It has fall sensors. However, this product is far too expensive. There are comparable window cleaning robots at a-zone for only 160, including shipping, for example the Mamibot W120-T. Sometimes you can get it for even less. The cleaning principle is always the same, there are cleaning pads at the bottom, the robot then has a caterpillar drive with which it moves over the glass and a fan provides negative pressure so that the robot does not fall off the glass.