Geartronic is Volvo Cars' name for its manumatic transmission, similar to Porsche's Tiptronic. It is available in 4, 5, 6, and 8 speed models, and is controlled by a microprocessor. The microprocessor automatically shifts to the next gear if a forgetful user in manual mode red lines the engine. Manual shifting is allowed with the gear stick in the manual mode. The gear stick can also be used just like any other automatic gearbox, where the transmission will shift automatically.