Robots are already capable of many things for us, including mowing the lawn and vacuuming our homes. The HOBOT-298 is a smartphone controlled robot that can clean your windows without you having to break a sweat. It is powered by a brushless DC motor and uses ultrasonic water spray. It converts water into 15 micrometer dense mist and can cover a square meter in 2.4 minutes.
The HOBOT window cleaning robot is compatible with iOS & Android devices. The water tank can clean a 40m2 area. The machine has a noise rating of 64 dB @1m.[where to get it]