The scientific name of black box is called aviation flight recorder. The reason why it is called black box is not because it is black, but because it can help crack the secret of flight accident. The black box contains flight data recorder and The gunshot recorder is two sets of devices, which can record the relevant technical parameters and the sound in the cockpit half an hour before the plane stops working or crashes. When necessary, it can replay the recorded parameters for flight testing and used for accident analysis.
According to the above definition, which of the following devices belonges to the black box?
A certain black box on the plane was activated at the same time as the accident occurred and recorded relevant information