Window Cleaning Robots: Round shape or Square shape

In regards to window cleaning robots, there are 2 main types: Round-shaped & Square-shaped; both attach to the surface of a window with the help of a vacuum motor. Round-shaped have 2 cleaning wheels with microfiber (double side usable). There's a vacuum motor inside to rotate the wheels while the device is moving; similar to hand movement...
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NEW HOBOT-388 Window Cleaning Robot with Ultrasonic Water Spray

HOBOT announced a new robot on CES this week. HOBOT-388 is a window cleaning robot carrying the new patented ultrasonic water spray nozzle that can nebulize water to 15μm mists then sprays it evenly on the glass like the effect of human exhales on the glass. Benefited from a vacuum motor inside, two specially-design cleaning wheels and a mi...
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