Propane.
It uses the green Coleman 1lb type, or likely could be plumbed off a larger tank.
Pretty nifty unit, the companies online video for it is incredibly poor though. Kinda goofy actually.
Has a nonstick griddle, a grill for burgers, dogs & such, can be used as just a burner for a pot/tea kettle & supposedly the top cover can be used as a wok.