Publisher Summary This chapter analyzes the monitoring hardware used for video security systems. Several monitor types can be used in the security room, which include the standard analog cathode ray tube (CRT) monitor and the digital flat-screen liquid crystal display (LCD), plasma display, and to a lesser extent the new organic light emitting diode (OLED) displays. Where space permits, the standard CRT monitor is a cost-effective solution and can provide a bright, high-resolution monochrome or color image. In more confined spaces or in any completely new installation, the flat-panel display should be considered. The quality of the image displayed is a function of the number of TV lines the analog monitor can display, and the number of horizontal and vertical pixel elements available in the digital flat screen monitor. The use of digital flat screen monitors is increasing rapidly and interfacing digital computer systems with the monitor have brought about problems, which need solutions. These include interfacing the analog signal provided by most cameras to the new digital monitors.