What safety feature alerts firefighters of low air supply in SCBA?

The safety feature designed to alert firefighters of a low air supply in a Self-Contained Breathing Apparatus (SCBA) is an audible alarm. This feature is crucial because it provides a distinct sound that can be easily recognized by the user, even in noisy environments typically found in firefighting situations.

The audible alarm serves to ensure that firefighters remain aware of their air supply status, which is vital for their safety. When the air supply falls below a certain threshold, the alarm activates, prompting firefighters to make necessary decisions regarding their air management and potentially their exit strategy. The immediacy of an audible signal is fundamental in high-stress scenarios where visual or tactile signals may be overlooked due to smoke, darkness, or other sensory distractions.

While other options such as LED indicators, visual displays, and vibrating alarms can also provide valuable information about the SCBA status, the reliance on sound as a primary alert mechanism aligns with the need for clear and unambiguous notifications in firefighting operations. This design choice prioritizes the ability to respond promptly to potentially dangerous situations, ultimately enhancing firefighter safety.