【Automatic Ultrasonic Water Spray】: The window cleaning robot is equipped with a 30ml water tank and ultrasonic spray system evenly moistening window surfaces you can switch auto/manual spray via remote control (note: square window corners need manual cleaning) 【5600Pa Powerful Suction Cleaning】: The robotic window cleaner features 5600Pa strong suction 4-minute 1㎡ cleaning speed and high-density microfiber cloths for streak-free scratch-free crystal-clear glass results 【3 Intelligent Cleaning Modes】: The window robot cleaner offers 3 customizable modes (top-to-bottom/left-to-right/right-to-left) adapting to different window sizes shapes and surfaces including glass doors mirrors and tiles 【Dual Spiral High-Efficiency Wiping】: The electric window cleaner uses dual-spiral wiping system with 5 sets (10 pieces) of non-shedding microfiber cloths concentrating and removing dirt effectively without scratching glass 【Multi-Layer Safety Protection】: The window cleaning robot has built-in lithium battery (20-30 mins suction during power outage with alarm) detecting window frames and obstacles for high-rise use safety