"STANLESS STEEL CASE,MEASURES AISPEED,ALTITUDE COURSE AND FINE,HEADING,VERTICAL ACCELERATION,1/4 INCH MAGNETIC TAPE 388' NOMINAL TAPE SPEED WRITE MODE INCREMENTAL 1 LPS, READ MODE CONTINUOUS 5 LPS,25 HOUR MIN OF CONTINUOUS FLIGHT DATA RECORDING AT 768 PBS,REEL TO REEL,BELT DRIVEN, OPERATING AND NON-OPERATING TEMPERATURE -55 TO + 77 DEG C, ALTITUDE -1000 TO 50,000 FEET, HUMIDITY 0 TO 95% RELATIVE @ 32 DEG C"