This document discusses Chapter 27 of NFPA 72, which covers public emergency alarm reporting systems. It outlines the general requirements and fundamentals, including management and maintenance, communication methods, alarm processing equipment, and alarm boxes. Wireless boxes must provide at least three identifiable functions to the communications center: test, tamper, and fire. The primary power source for wireless boxes can include a utility distribution system, solar photovoltaic power, user power, or an internal battery.