Know nothing about Aviation. This was a estate sale find. The owner retired from flying in 2004 due to age and health history last flight log was  9 1 03 .his flight bag and books have been in dry storage since his retirement.(family members info).  Cord approximately 52 inch long headset ear pads seem to be good .headset could use a little better cleaning.  Headset is untested .family said worked great on last flight. Please look at pictures closely shipped well protected