What type of alarm does the PASS device emit first if no movement is detected?

The correct answer is that the PASS device first emits a low-level alarm if no movement is detected. This initial alert serves as a warning to nearby personnel that the firefighter may be in danger, allowing for a quick response before the situation escalates. The low-level alarm is crucial because it offers a chance for the firefighter to regain movement and reset the device, thereby avoiding a full alarm situation where immediate assistance may be required.

The low-level alert provides a balance between drawing attention to the potential issue and not creating unnecessary panic. If the absence of movement continues, the PASS device will then escalate to a full alarm, signaling a more urgent need for intervention. This sequential alarm system—starting from a low-level alert—is an important feature in enhancing safety and situational awareness in emergency scenarios, allowing for potential reassessment before escalating to a critical status.