How many components may a simple residential intrusion detection system consist of?

A simple residential intrusion detection system is typically designed to provide effective coverage of a property by detecting unauthorized entry and alerting the homeowner. The correct answer indicates that a typical setup may include a few door contacts, a motion sensor, and a keypad.

Door contacts are essential as they detect when doors or windows are opened, while motion sensors monitor areas within the home for any movement that may signify an intruder. A keypad allows for user interaction, where the homeowner can arm or disarm the system, and potentially enter codes that control various functions of the system. This combination of components works together to create a more comprehensive and effective security solution for a residential setting.

The inclusion of multiple types of sensors and a user interface encourages robust security coverage, allowing for a response to different intrusion scenarios. This multifaceted approach enhances the system's effectiveness compared to setups with fewer components.