''Several options exist to recharge eVU's batteries using custom-made docking stations, stand-alone battery chargers, or using a single DC wall outlet. The player can also be powered via 15VDC or 110VAC seat power''

 http://www.edigital.com/evu7.htm

I can see them poor stewerdist now,,, Yes, sure you can just leave it attached to the seat as you depart  - it's got power right there. lol

Nice depictions on site-

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