Milking is a rather complex process, consisting of several tasks that require a lot of milker's work and attention. Furthermore cows should be milked usually twice a day in the lactation period (approximately 300 days) so it means everyday farmer's care and subject of all farm schedules to this rhythm. The most demanding part of milking besides collecting of cows for milking and cleaning of milking machine after that, is udder washing, installing milking units and milking itself. In automatic milking system cows are free to come to the milking machine so they decide by their own for time and interval of milking. The system cleans, pre-milks, dries and stimulates each teat individually using water, compressed air and a vacuum. A teat position laser sensor  scans udder and helps robotic arm for automatic teat-cup application and removal. The gate system controls cow traffic. When the cow enter the milking unit (due to highly palatable feed that she finds in the milking box), a cow ID sensor reads an identification tag (transponder) on the cow and passes the cow ID to the control system. If the cow has been milked too recently, the automatic gate system sends the cow out of the unit. If the cow may be milked, automatic teat cleaning, milking cup application, milking, and teat spraying take place. The system also monitors udder health and count somatic cells as an indicator of the milk quality and presence of harmful bacteria.