The Karcher RCW 4 Extra is a window cleaning robot designed to handle glass surfaces, mirrors, and shower cabins, including those without frames. It uses four sensors for systematic navigation to detect edges and objects, while six pump-operated spray nozzles keep the microfibre wiping cloths continuously moist during operation. You can choose from several modes depending on your needs, such as quick or intensive cleaning, spot cleaning, polishing, or a manual mode for specific areas. With a suction power reaching up to 5000 Pa and a 150 ml detergent tank that covers roughly 100 m² per fill, this device manages the heavy lifting of window maintenance. The white unit is compact, measuring 264 x 256 x 72 mm and weighing about 1.5 kg, making it easy to move around your home. It operates at a sound pressure level of 62 dB(A) and includes an emergency lithium-ion battery that provides up to 40 minutes of power if the main connection is interrupted. Control is simple via the included remote or the on-device button, with an LED display and voice output keeping you informed about its status. The package comes with a safety rope for security, four machine-washable cloths, and a bottle of RM 503 window cleaner to get you started immediately.