Just moved into a new place and looking to add a more modern WiFi thermostat, Nest or Honeywell. My understanding is these work on a 4 wire system and most homes have 3.

Well yesterday I pulled the thermostat off the wall and discover it only has two wires, Red and White and the thermostat actually has batteries to power it.

No AC just a forced air gas furnace. Is it even possible to make a newer thermostat work on this system? I'm guessing there will be some wiring involved?