somewhere out there. whether it's land or sea. that is the emergency locater transmitter in the tail. >> correct. >> that is the epirb, on the rafts. and then, of course -- we like to call them the old fashioned name, black boxes, cockpit voice recorder. give me a breakdown on those other two transmitters and battery life left on the black boxes. >> well, the elt and the epirbs are short-term, 24 to 48 hours. once they touch water they start sending a signal for only 24 to 48 hours. >> so what was in the tail and what was on those life rafts is done. >> correct. however, if that had happened, if they did get water in them, there's 16 satellites constantly monitoring that frequency. so that's what brings in some puzzling -- >> and they're getting nothing. >> they got nothing. >> water is one trigger. les, i thought the other trigger was actually impact. so we know one thing. this plane is not flying 12 days