ACR ResQLink 400 - SOS Personal Locator Beacon with GPS and Global Coverage - Designed to Alert Search and Rescue Efforts for Any Outdoor Emergency - Ideal for Hiking, Hunting, Boating, Fishing

How An EPIRB or PLB Rescue Works The Anatomy of a Rescue - Stage 1 When activated, EPIRBs and PLBs send a unique distress signal on the 406 MHz frequency to the Search and Rescue Satellites.

Each beacon is programmed with and sends a unique digital code called a HEX ID or Unique ID.

The HEX ID identifies the type of beacon and, Search and Rescue use the HEX ID to identify the beacon registration information provided by the beacon owner.