N.K.
This sounds like you may be speaking of the Roomba vacuum. It is a robotic cleaner. Under normal operating conditions, it is able to navigate a living space and its obstacles while vacuuming the floor, though I have heard mixed reviews. I guess it depends on the model. Some years ago, a friend told me it was a huge waste of money, but now someone boasted about its virtues, so I assume the newer models are better equipped to do the cleaning, but at $350, I'd rather stick to the true and tried (and more economical!) method of the ol' broom and map. They say the Roomba is not as loud as a traditional vacuum cleaner and works on wood, vinyl, tile, and carpet. The Roomba does require maintenance after each cleaning cycle. This requires emptying the dust bin, removing the brushes and filter to clean and, sometimes, cleaing the sensors that may have dust buildup. If you don't mind this and the price tag, go for it.
You can read more on it, including reviews, here if you decide you may want to buy it, regardless of its huge price tag: http://www.amazon.com/iRobot-560-Roomba-Vacuuming-Silver/...