Google Cardboard, a cheaper version of Oculus Rift VR (Virtual Reality) glasses. Works great with 4-7″ (inch) Android phones. Google came up with this inexpensive way to use VR and get 3D few months ago. You just need to download an app from Play Store and follow the instructions. And you are ready to use this. Since then, China have been manufacturing & selling plenty of Google Cardboard DIY kit. As time passed, they are adding more feature in these cardboard kits.

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