How does the Scott Air-Pak X3 SCBA alert users of low air supply?

The Scott Air-Pak X3 SCBA alerts users of low air supply by emitting a chirping alarm from the regulator. This audible warning is designed to draw the attention of the user so they are aware of the critical situation regarding their air supply, prompting them to take necessary action, such as exiting the hazardous environment or initiating a refill of the air supply. The chirping alarm is a crucial safety feature, allowing firefighters to remain aware of their breathing apparatus status without needing to rely solely on visual or tactile alerts.