SmartTAG (acronym in Malay for Sistem Membayar Automatik Rangkaian Tol or "Toll Network Automatic Payment Systems") is an on-board unit (OBU) vehicle-based device used as an electronic toll collection (ETC) system over long distances (maximum 15 metres) to complement Touch 'n Go, a card-based system. It was first introduced in Malaysia in 1999 and is also used as an Entrance Access Security.