Automatic Distress Signal Unit (ADSU) is a personal safety device used by firefighters, the device notifies nearby firefighters of a firefighter in distress. All firefighters are equipped with an ADSU when they go into a burning building, the device can be manually activated however it usually sounds when a firefighter is motionless for more than fifteen seconds or when the oxygen tank is empty.

Also Known As Edit

  • Distress Signal Unit (DSU)
  • Personal Alert Safety System (PASS)

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