The Pico G2 4K is a standalone 3 degrees of freedom (dof) VR headset. Standalone means that the Pico G2 4K works without any sensors or wires. 3 Degrees of freedom refers to the fact that it is possible to be fully immersed and look around in the Pico G2 4K, but not walk around. However, 6 degrees of freedom headsets gives you the possibility to walk around in virtual reality. 3 degrees of freedom headset are ideal for 360 degrees video playback.