Name one type of notification device used in fire alarm systems.

Notification devices in fire alarm systems are crucial for alerting occupants of a building to the presence of fire or smoke, enabling them to evacuate safely. Sirens and strobe lights serve as effective notification devices because they provide both audible and visual alerts.

The siren generates a loud sound that can be heard throughout the premises, drawing immediate attention to the emergency. Strobe lights complement this by providing a powerful visual cue that is especially beneficial in environments where noise levels may prevent occupants from hearing the siren, or for individuals who are hearing impaired. This dual approach enhances the likelihood that all building occupants will be made aware of the danger, making sirens and strobe lights essential components of a comprehensive fire alarm notification system.

In contrast, the other options—sensors, heat detectors, and control panels—serve different functions in a fire alarm system. Sensors and heat detectors are responsible for detecting fire conditions, and control panels manage the overall system, but they do not provide the notifications necessary to inform occupants of an emergency situation.