2015 New Google Cardboard V2 3D VR Virtual Reality Glasses, suit for all size Mobile Smartphone with QR Code Phone Works with most iPhones and Android devices. Easy to assemble:just slide,flip,secure and enjoy Easy to assemble:just slide,flip,secure and enjoy Securely packed in a protective sleeve. Easily fold to original state and slide in the protective sleeve when not in use Compatible with ios and Android devices It is biconvexlens,made of optical acrylic,good transparency.37mm in diameter and 45mm focal length