What feature of SCBA helps to alert the user of malfunction?

The feature that effectively alerts the user to malfunctions in a Self-Contained Breathing Apparatus (SCBA) is the audible alarms indicating low air supply or equipment failure. These alarms serve a critical function in maintaining user safety during operations in hazardous environments. When air supply levels drop below a certain threshold or if there is a detectable malfunction within the system, the audible alarms activate, providing an immediate warning to the user.

This prompt notification allows the wearer to take timely action, such as exiting the hazardous area or checking the equipment, thus reducing the risk of suffocation or equipment failure. The presence of such alarms is a fundamental design element in SCBAs, as it ensures that the user is constantly monitored for safe operational conditions and is alerted in real-time to address any issues that may arise during their use.