This document summarizes the key components of a residential security system. It discusses lighting, fire security features like smoke detectors and fire doors, and electronic security systems including alarms, CCTV cameras, and intercom systems. The document also outlines different types of door locks and fire extinguishing arrangements to secure the home and address potential fire hazards. In conclusion, it notes that security systems are commonly used in places like hospitals, banks, and ATMs to deter intruders and promote safety.