The robot attaches well with 2,800Pa suction power , which frees your hands & time out of the annoying window cleaning work and avoids the risk of standing and working at height. Unique cross spray in dual directions effectively keeps a constant mopping humid status, dissolving stubborn stains as easy as anything. Internal drive system ensures non-slip steady movement and protection against power failure, thanks to high-quality materials and precise gravity settings, which can’t be safer. The robot cleans the window completely and thoroughly with an effective forward-reverse motion in 3 adaptive modes: quick cleaning, deep cleaning and spot stain removal. Even frameless glasses cleaning is nothing difficult due to the high precision coupling sensor, which detects edges and fits the cleaning path within 0.02 seconds. The strong capacity of reservoir and water-saving spray enables neither frequent mopping pad replacement nor frequent water tank refilling.