The main advantage as below : 1) Independently developed 4.0 high definition special lenses –More clear , Prevent dizziness . 2) Independently developed new light foam material —— More comfortable and light weight 3) Fit for 4.0 – 6.3inch smart cell phone . It is fit for most of smart mobile phone 4) More reasonable mobile -putting way , be stronger immersed in feelings and easier operations 5) Support more external connection way , wire connection charge and easy for headphone plug-in 6) Equip with VR(virtual reality glasses) case exclusive gamed pad to play game , online shipping —-Amazing experience 7) concealed shell part connection and technological streamline appearance design — more concise and fashion appearance .