We consider it's important to tell you about devices that save lives. The Personal Locator Beacon (PLB) and Emergency Position Indicating Radio Beacon (EPIRB) have been shown to be useful in practice and saved many lives. Let's see how they work. PLB and EPIRB operate on the same principle: the transmitter located inside the sealed enclosure is activated and starts transmitting a digital signal at a frequency of 406 MHz. Activation can occur by force or as a result of contact with water. This si