Brilliant windows cleaning robot - just press either of 3 buttons on the bottom . The robot will clean automatically, finish automatically and stop automatically. Only 2.4 minutes for one square meter . For 4m sq of glass, that is about 10 minutes to finish cleaning. The robot can clean wooden doors, mirrors, wall tiles, marble walls, anything smooth and vertical. The robot cleans with very low noise - less than 60Db It will detect the window edge and then protect the robot against losing suction and falling down or being damaged. You can add an optional UPS and rope tie to prevent any possibility of damage.