Xreal One Has Built-In 3DoF Tracking & A Wider Field Of View

www.uploadvr.com: By default, all previous Xreal glasses just acted as a fully head-locked external monitor for whatever device (such as your phone) you connect over USB-C. Achieving rotational 3DoF tracking so the screen stays in place when you rotate your head required using the Xreal Beam or Beam Pro adapter, unless you were using a PC or one of the few specific Android phones with integrated Xreal support.