Electrolux Trilobite Vacuum Robot www.erobotshop.com ZA2 is like a bat, the Trilobite sends out harmless ultrasound to detect objects and avoid them. It starts with the edge of the map along the walls of the size of the room while cleaning the corners. Then it effectively cleans the entire room. Thanks to technology within the intake, not only absorbs dust balls and stray cornflakes, but fine particles as well. A sophisticated suspension prevents the machinenot to get blocked, and a special sensor is never fell down the stairs.