The first vacuum cleaner was designed in 1869. Since then, vacuum cleaners have changed a lot. Nowadays the robot vacuum cleaner is getting more and more popular. This device cleans a house automatically. Following a programme, the robot drives slowly around the house and makes it cleaner. It operates with brushes and a tube. The robot is so flexible that it can get under a table or sofa or reach dust in corners. Some advanced models can also wash floors of all kinds. These functions are provided by a complicated electronic system and sensors inside. The vacuum cleaner looks like a plate and can be kept in the corner. It is friendly to children and animals and works on electricity.