The Ameri-King AK-451 as an installed ELT (Emergency Locator Transmitter) has become standard equipment in many aircraft in recent times. The AK-451-21 is a compact and triple frequency transmitter at a value price. The Ameri-King AK-451 PLB is a COSPAS-SARSAT and FCC approved, 406 MHz Satellite P-ELT Personal Emergency Locator Transmitter, triple (406 Satellite /243 Military /121.5 Civilian) MHz. Having triple frequencies insures your distress message reaches both NOAA Satellite Operation and US Air Force AFSR Ground Operation, Search and Rescue Team, with 100% confidence, due to transmitting on both 243.0 Military and 121.5 Civilian bands, for immediate ground search dispatch, narrowing the searching time to the minimum. Alert time is typically within 3 minutes. The Position accuracy of the 406 MHz satellite qualitative test is about 110 meters at 9.5 degree Cross Track Angle, on the dry ground (found in Satellite Qualitative Test at a COSPAS-SARSAT approved Laboratory). The choice is clear, when it come to Safety, Speed, Accuracy, Reliability, Price and Product Support; Ameri-King’s AK-451-PLB is your best choice. The unit has a long lasting battery which lasts up to 78 hours when activated, is waterproof and flame retardant, and has been 500G shock and 1000lbs crush tested.