What type of device can be both automatic or manual and causes an alarm when activated?

An alarm initiation device is designed to trigger an alarm when activated, either manually or automatically. This device plays a critical role in fire alarm systems, as it serves to alert occupants and emergency services to potential dangers. Common examples of alarm initiation devices include pull stations and smoke detectors.

The key aspect that makes this choice correct is its dual capability: it can be operated manually by individuals, such as pulling a lever, or automatically through sensing mechanisms like heat or smoke detection. This flexibility is essential for effective fire safety management, ensuring that alarms are sounded quickly in emergencies, regardless of whether a person is present to activate it or not.

In contrast, an alarm notification device specifically signals an existing alarm, but does not initiate it, making it a different classification entirely. A smoke detector is indeed an initiation device, yet it is a specific type under the broader category of alarm initiation devices. Lastly, an alarm control unit functions as the brain of the alarm system, managing signals from initiation devices and coordinating notifications, but it does not directly serve the function of initiating an alarm itself.