ACR GlobalFix iPro 406 28480 EPIRB Category II Rescue Beacon with Manual Release Bracket, Built-in GPS, and LED Status Display 406 MHz Satellite Search and Rescue transmitter. Notifies authorities instantly if you are in a distress situation anywhere in the world. 121.5 MHz Homing Beacon transmitter allows nearby rescuers to home in on your position LED status indicator verifies operation, GPS fix, and self-test Includes Category II manual release bracket. Unit easily slips out of bracket for manual deployment. EPIRB will automatically turn on when it comes into contact with water Built-in GPS receiver for faster and more accurate position indication. Allows rescuers to pinpoint your exact location Five-year, non-hazmat battery. Unit will operate for at least 48 hours when deployed, even after five years with monthly self-test