How does a smoke detector notify occupants of a potential fire?

A smoke detector primarily notifies occupants of a potential fire by emitting a loud alarm sound to alert people in the vicinity. This auditory signal is designed to be loud enough to wake sleeping individuals and alert those nearby to evacuate the premises or take necessary action in response to the fire hazard. The loud alarm is a critical feature, ensuring that it can be heard across various environments, including homes, commercial buildings, and public spaces.

While other options such as flashing lights, text messaging, and automatically calling emergency services may be features found in advanced or specialized fire alarm systems or smart smoke detectors, traditional smoke detectors fundamentally rely on sound as their primary method of notification. These additional features can enhance awareness and response but are not standard in all smoke detectors. Thus, the core function remains an audible alarm to ensure immediate attention during a fire emergency.