It is specially designed for thick glass (3~60mm or more). It's suitable for double-glass window, show window, store window, and so on It has powerful processors to compute the cleaning path, to detect edges of window by sensors, to clean the entire window automatically It has 3 kinds of AUTO modes can be selected by remote controller. Manual Mode is also provided System power will switch to internal battery while no electric power supplied Adopts micro-fiber based cloth to be easily swapped for wash and reuse