The cleaning of windows can be a very difficult, cumbersome task. In particular against the backdrop that modern architecture often features large and difficult-to-access window surfaces. The battery-powered WV 2 window vacuum cleaner facilitates the easy cleaning of even difficult window surfaces. As an innovative further development of a set, consisting of a spray bottle with a wiper, it impresses with its functionality and ergonomics. It is light and well-balanced in the hand. A sophisticated extension kit, consisting of two rods, makes the cleaning of tall or high windows easier: the window vacuum cleaner is attached to one rod and a micro-fibre pad to the other. This innovative feature ensures a high degree of safety as users can stand comfortably on the ground. The reduced height of the device also makes it easier to vacuum the lower sections of windows, protecting the user from hitting the window sill. The device can thus be operated solely with the thumb, eliminating the risk of slipping. To lend the device a smooth overall appearance, the design of this window vacuum cleaner has dispensed with air vents on the casing. The result is a harmoniously balanced design vocabulary that lends this device a sculptural elegance – its sophisticated functionality is noticeable with every touch.