Accurance OV-102S(E) is an anti-tailgating system with human tracking technology and direction-determining capability, for multiple applications. The sensor provides various levels of action in case of tailgating, including “alert/deterrence,” “deterrence/simplified prevention” and “prevention,” according to the security levels customers demand and the situation. The system offers various advanced features, including the Escort Function, which allows entry of a visitor who does not have the authoriZed credentials needed to enter the secured area, and the external output of images obtained by a detection unit.