CANIS 3D Virtual Reality Video Glasses Cardboard for 3.5" to 6" Smartphones (Black) Head girth adjustable. Suitable for 3.5-6 inch screen mobile phone. Convenient to use: can watch at anytime anywhere whether sitting, lying or standing Can be assembled and used within minutes of delivery Designed eactly to Google's specifications You will not feel visual fatigue and dizzy even you use long time w/ the resin lens