2800Pa Suction 3 Auto Cleaning ModesLIECTROUX HCR-09 robot window cleaner features 2800Pa suction and three cleaning modes providing strong adsorption and smooth movement. Dual-disk Simulated TwistingIt has a simulated action of hand wiping to remove dirt on glass with rotating and twisting movements.High Efficiency"A-wheel twisting" to first remove most of the floating dust and "B-wheel twisting" to remove dirt and water stains.Japan-made Brushless MotorAdopting the Japan-made brushless motor Liectroux HCR-09 can offer a fast cleaning speed of up to 5 minutes per square meter. And the vacuum suction is more stable without slipping or offsetting.High-density Cleaning Fiber ClothIt can help to effectively remove all kinds of dirt dust and particles and operate repeatedly for cost reduction and environmental protection.Applicable for a Variety of SurfacesLIECTROUX HCR-09 Window Cleaning Robot is applicable to glass of any thickness such as bathroom mirrors wooden Tile surface marble walls windows around the house framed glass etc.Built-in Uninterruptible Power System (UPS)UPS with power-off protection to automatically maintain the power supply for 20 minutes after disconnection of the main supply.