Soyan 65 mm Focal Length Virtual Reality DIY 3D VR Glasses,Google Cardboard Head Mount Plastic Version 3D Video Glasses, VR Bi-convex headset Free Hand for 4.7-6 inch Smartphone

This item does not have the Magnet Parts so it can not control like the Google Cardboard 3D. But you can use this item view 3D movie and 3D game on your cellphone.
Diameter 30mm
Pupil Distince PD had been designed and adjusted reasonablely
Focal Distince FD designed and adjusted reasonablely
Max size fit 16.5 cm x 8.5 cm
This paragraph does not contain NFC component (NFC module automatically recognizes only open the program, click on the icon to open the step is omitted software, other experiences are the same) Cardboard applications can be run on most modern Android Android phones. Phone needs to run Android 4.1 (Jelly Bean) or more versions of Android. It can work with arduino Android ISO system cell phones which can be 4 - 6 inches.
FL can be adjusted

max size of the phone can cover : 85x165mm Diameter of the lens : 34mm
FL of the lens: 75mm
Myopia: less than 600 degree.