KKmoon Universal Google Cardboard DIY Virtual Reality 3D Video Glasses With Headband 2D to 3D Film Converter for 4~7in Smartphones for iPhone Samsung Embedded 3D experience. Converter for smartphones: It can change ordinary 2D image into 3D stereo image on screen. Secret images: Other people can not see anything except to the wearer himself. Large lens cone: Image is more clear. Head wearing design: Watching at anytime and anywhere whether sitting, lying or standing. Environmental: Using ABS and spherical resin lens materials without stimulation plastic sheet.