Google cardboard 2.0 enjoy virtual reality on your smartphone anywhere! Color: customized Material: cardboard Lens: 37mm or 34mm Lens material:pmma Phone screen size:3.5 inches to 6.0 inches Product size: 15cm*6.5cm*8.5cm Compatibility: android and iphone Usage: watching 3d videos or games Features 1. Enjoy virtual reality on your smartphone anywhere. 2. Suitable for phone screen size from 3.5-6.0 inches. 3. Works with iphone and android phone. 4. 3-step to assemble less than 20 seconds. 5. Asymmetrical biconvex lenses diameter for 37mm with 50mm focal length. 6. New input method. Conductive foam button woks better. 7. Available in all kinds of colors. 8. Logo and pictures customized available How to use 1. Assemble the google cardboard. 2. Download vr videos or games from the internet to your phone. 3. Put your your phone into the cardboard. 4. Enjoy amazing vr moment.