Parameter: material: high quality abs+ PC lens: optical glass lens diameter: 35mm visual angle: 100% effects: 1050in Imax screen size of phone: 4.0-6.0 Inches object distance: 55-70mm pupil distance: 55mm-75mm item dimensions: 158 x 90 x 110 mm (6.2 x 3.5 x 4.3 inch), weight: 382g(0.84 lb.), color: black and white. If you have a thick phone case, please remove it before putting your phone in the headset. It would better to use phones with high-resolution and large-size screen. This headset is only for 3d videos/games in split screen mode. 3D videos can be found on YouTube/ other apps (such as google cardboard) on google play and apple store. Never play your phone when it is charging.