They use the iClass, which is the new HID thing.

Once I get a home/office set up with a hardware lab later this month, I'm going to try to see if I can build something user-powered vs. battery which does this kind of thing (similar to how the Mas-Hamilton or Kaba-Mas X09 works) and speaks to iClass.

I was hoping for something a bit more discreet on the outside of the door like the Lockitron, and uses FeliCa or MIFARE cards.

Self powered by the user moving the handle.