A Roomba according to Wikipedia:
Roomba is a series of autonomous robotic vacuum cleaners sold by iRobot. Under normal house conditions, the Roomba is able to autonomously vacuum the floor while navigating and avoiding obstacles.
Roomba was introduced in 2002. As of February 2011, over 6 million units have been sold worldwide. It features a set of basic sensors that help it perform its tasks. For instance, the Roomba is able to change direction upon impact with obstacles, detect dirty spots on the floor, and detect drops to keep itself from falling down stairs. It uses two independently operating wheels to allow for 360 degree turns. Additionally, it can be adapted to perform other more "creative" tasks via an embedded computer in conjunction with the Roomba Open Interface.
