Send a distress call from any point on the globe and make it easier for rescuers to pinpoint your position quickly with this four-stage system. First, a coded satellite signal from the 406 MHz transmitter gives search coordinators a regional fix on your location so rescuers know where to start. The secondary 121.5 MHz transmitter sends out a homing signal that leads search parties to your correct position and elevation. In addition, the Fast Find GPS tracker pinpoints your position to within a 62m radius to dramatically reduce response time for air borne and ground-based search teams, getting you the help you need as fast as possible when time is of the essence. Lastly, an integrated LED flasher signals S-O-S in Morse code to make it easier for approaching search teams to spot your location at nighttime or in low-light conditions. It's subscription free and not call-center based. Powered by a 6-volt lithium battery with a storage life of five years. High-visibility yellow finish. Compact to fit in your pocket; takes up little space in your pack. Sealed for waterproof durability; can be submerged to a depth of 30 ft. for up to 5 min. Tests for reliable operation in temperature extremes from -20°F to 131°F.