This document discusses and compares wired and wireless security alarm systems. It provides information on key system components such as the central control unit, door/window sensors, PIR motion detectors, vibration detectors, smoke detectors, and glass break detectors. It describes how each component works and best practices for installation, such as mounting heights. The document also outlines advantages and disadvantages of wired versus wireless systems, noting that wired systems require more installation effort but are more reliable, while wireless systems are easier to install and move but rely on battery power.