???? FAST AND QUIET: Brushless motor. Wexbi W189 is the fastest window cleaner robot on the market! It only takes 3 minutes to clean 1 m2 (10.8ft2). Almost no noise, very quite, it has longer service life too! It is simply the best professional window washing solution for you! ???? INTELLIGENT PLANNING OF CLEANING ROUTE: More efficient window washing equipment. Cleaning robot achieve 99 % cleanliness at all times. This Robot cleaner has built-in detecting edge sensors. It cleans frameless glass without leaving any streaks or water marks. ???? SUITABLE FOR DIFFERENT SMOOTH INTERFACES: Glass, marble, tiles, table, mirrors, windows, floors, kitchen counters, etc. You can use smart robot mop to wash both the windows and bathroom walls! ???? BUILT IN UPS ANTI-FALLING SYSTEM : Protect the robot cleaner from falling when the power suddenly cuts off. The UPS system makes sure that the automatic vacuum robot sticks to the surface, even in case of the power cut off! It will never just fall off, if there is no power! ???? MORE CONVENIENT AND EASY TO USE : Automatically back to the origin after cleaning finished. 2.4m long distance remote control. Maximum remote distance up to 15m. No limitation of wiping height. Robot mop can support 12 meters long extension cables.