MH370 ELT details here...
http://www.cnn.com/2014/04/25/world/asia/malaysia-airlines-flight-370-beacons/
http://eandt.theiet.org/magazine/2014/03/flight-mh370-emergency.cfm
http://www.cnn.com/2014/04/25/world/asia/malaysia-airlines-flight-370-beacons/
http://eandt.theiet.org/magazine/2014/03/flight-mh370-emergency.cfm