If they don't need wiring, they get their power and signal just like decoders do in locomotives. In fact, I would bet big money that a simple stationary decoder is what runs the points.
I hope you get some evidence as to their reliability. I had EZ-Track 14 years ago, and it wasn't bad. The 18" turnouts were reliable, but they needed work to keep the flanges from picking the points. A DCC version of them would be pricey, and I sure hope they work reliably.