What happens when the Pre Alarm is triggered?

When the Pre Alarm is triggered, the correct response is that alternating green and red buddy lights activate. This visual signal serves to alert both the user and their team that a pre-alarm condition is occurring, which typically indicates that the air supply is nearing a critical level or that there may be an issue requiring immediate attention.

The alternating lights are an essential component for communication among team members, particularly in low-visibility or noisy environments, allowing for quick identification of a potential problem. This feature ensures that the wearer and others nearby can respond promptly to maintain safety and operational readiness during an emergency situation.

In contrast, the other options pertain to different types of alerts or indicators that do not specifically represent the pre-alarm status in SCBA systems, such as steady or flashing light indicators, which signify different operational states, and continuous sirens, which indicate more critical alarm conditions. Understanding these visual alerts is critical for safety and effective communication in hazardous environments.