What are the headphones and heart rate monitor for? Do I need them?

EaseVR works without the headphones and the heart rate sensor, but they are highly recommended because they add a level of biodata to the VR experience. The headphones record information about your breath and the heart rate monitor records how fast your heart rate is beating. This biodata is incorporated into the VR experience to make it more interactive, more effective, and more unique to you. You will actually be able to visualize feedback from your own body in VR, allowing you to reach a heightened state of relaxation and control over your physiological states.