What type of alarm system primarily relies on user interaction for activation?

The alarm system that primarily relies on user interaction for activation is the intrusion alarm system. This system is designed to alert property owners or security personnel when unauthorized entry is detected. User interaction is central to its functionality, as individuals must typically arm or disarm the system using a keypad, remote, or smartphone app. Additionally, these systems often have features that allow users to customize settings or activate specific zones based on their needs.

In contrast, other alarm systems such as fire alarms and carbon monoxide detectors are generally designed to operate automatically without user intervention. They activate in response to specific environmental triggers, such as smoke or elevated levels of carbon monoxide. Environmental monitoring systems also operate autonomously to track changes in conditions like temperature or humidity and may alert users based on pre-set parameters, but do not rely on active user engagement for their operation.