VR glasses such as those from the celexon VRG series, are becoming increasingly popular. The passive VR glasses are most common and are used with a smartphone as a display. The passive 3D Virtual Reality (VR) glasses are significantly less expensive than the active VR glasses such as Oculus Rift or the Playstation. Another advantage is that the content comes from the smartphone and no further image source is required. The celexon VRG glasses series can accommodate several different smartphone sizes. The higher the resolution of the smartphone, the better the result on the VR glasses. The VR glasses offer different features such as built-in headphones and multiple adjustments for extra comfort.