In which two modes does the PASS system activate?

The PASS (Personal Alert Safety System) is designed to alert firefighters when they are in distress or incapacitated. It primarily activates in manual and motion-activation modes.

In manual mode, the firefighter can activate the alarm intentionally, which is useful in situations where they may need help but are still able to operate the device. This allows for a quick response from fellow firefighters who may not be aware of the individual’s situation.

Motion-activation mode serves as an automatic safety feature. If a firefighter becomes immobile for a set period, the PASS system will activate the alarm on its own, alerting others nearby that the individual may be in trouble. This is crucial in scenarios where a firefighter could be injured and unable to call for help.

The other options—visual and auditory, and silent and alarm—do not accurately describe the operational modes of the PASS system. While the system does create auditory alerts, the emphasis is on the two specific modes of activation.