An Emergency Position Indicating Radio Beacons (EPIRB) is primarily used for emergencies at sea. A personal locator beacon, or PLB for short, is a personal electronic transmitting device that is designed to alert potential rescuers to a life-threatening situation in the air, on water or in remote areas.
Personal locator beacons are handheld devices that send out a signal on 406 MHz, the same frequency used for newer emergency locator transmitters. You can activate a PLB by simply by extending the antenna and pressing the ON button—and it transmits a powerful distress signal with a unique digital code.
PLBs will cost approximately $300 - $800, depending on the model and the manufacturer.
All beacons can be registered at https://beacons.amsa.gov.au/registration/