Metro,
If you lose use of the Sony, most of the DCs in the aircraft work just fine, except that they mess up your hair so you look like captain Alfalfa when saying goodbye to the pax. Of course, the Telex, et al, give you that line across the scalp that gives the impression (no pun intended) that you've recently recovered from brain surgery.
Just stock up on antimicrobial wipes. You never know where those DCs have been.