MicroFix PLB - Personal Locator Beacon (PLB) uses 406 MHz technology -- credited with saving over 20,300 lives since 1982 -- to send a distress signal with GPS information through the COSPAS-SARSAT satellite system, providing lifesaving rescue services during outdoor emergencies. Simply deploy the antenna, and press the activation button to send for help. Attachment clip keeps PLB in easy reach. Waterproof to 33'.