Black Box Pinger Manufacturer: Flight 370's black box batteries has 40 days

Investigators got new information that may help them narrow the search for Malaysia Airlines Flight 370 on Thursday - Australian officials announced that a search plane has detected a possible signal - the fifth so far - from the locator beacons from the missing jet's so-called black boxes.

If the signals that are being detected are the missing aircraft - with the investigation entering its 35th day - how long until the batteries of the black box pingers go dead?

OutFront, CNN's Richard Quest and Anish Patel, president of Dukane-Seacom, the largest manufacturer of black box pingers. Authorities confirm at least one of his pingers was on board flight 370.