What does the PASS device do when a firefighter becomes motionless?

The Personal Alert Safety System (PASS) device is designed to enhance the safety of firefighters by alerting others when a firefighter becomes unresponsive or motionless. When the PASS device detects that there has been no movement for a specified period of time, it activates a high-pitched alarm. This loud alarm is intended to attract the attention of other firefighters nearby, ensuring that they can take action to locate and assist their colleague.

While the other options may sound plausible, they do not accurately describe the primary function of the PASS device. For instance, although a low warning tone might suggest some level of alert, it is the high-pitched alarm that is specifically designed to signal for help in an emergency situation. The flashing light signal and automatic evacuation features are not standard functions associated with the standard PASS device in the context of a firefighter becoming motionless. Thus, the correct recognition of the device's function is crucial in understanding its importance in firefighter safety and emergency response.