Originally Posted by AirportGyms
Maybe go into the bathroom to put it on so no one freaks outs when they see the wires and electronic box.
For me, this would be a reason to get it out and put it on in the middle of the cabin.
That would be an interesting way to "test" the system, wouldn't it? Sit there quietly for a few minutes and look like you're praying. Then pull out the unit and start to fiddle with it a bit.
I doubt any arrest would be possible since the equipment obviously isn't prohibited.