The past 30 years have brought significant changes in the application of security electronics and communications technologies supporting the operational and security functions of correctional facilities. Today, the structure of security electronics and communication systems has changed significantly with significant technological advancements over the past 30 years. This article addresses selected technologies or products and the significance of the changes in the products or the development of new products or technologies that have impacted the structure and operations of security systems today as compared with system incorporated into the correctional facility security system designs of the 1970s. Security system components addressed include: controllers for monitoring and control, operator interfaces, networks providing communication linkage, perimeter detection systems, closed-circuit television systems, and video recorders. The last 10 years has shown the corrections field witnessing a significant increase in the amount and type of technologies available to corrections.