It usually does. But --

[ she'll pause to stick a hand into the collar of her shirt, and she pulls out a simple necklace with a small crystal attached to it ]

This is a special crystal that comes from this world. If you use it you can operate technology in the Dead Zone. Problem is, we only have a few of these small ones -- which only give off about as much energy as a small battery. They have a much bigger one, and we have yet to figure out where they got it from.