DEFAIRY Pupil & Focal Distance Adjustable Virtual Reality Headset Google Cardboard VR Helmet 3D VR Glasses with Immersive Viewing Experience for iPhone Samsung, Black Lightweight, durable construction with versatile design.The humanized head strips design to feel comfortable while wearing. Lens adjustable in both pupil distance and focal distance. Regulate the lens forward or backwards to get best focal point for clear image. It is suitable for all people in different eyesight(especially shortsight people). Push the lens handle on top of VR headset left/right to get the best Pupil Distance to matching for users' eye distance for best 3D experience, furthermore, pupil distance helps to change the FOV value for different application and movies. Push the lens handle on top of VR headset left/right to get the best Pupil Distance to matching for users' eye distance for best 3D experience, furthermore, pupil distance helps to change the FOV value for different application and movies. The maximum handset suitable size of phone: 170 x 80 x 12mm (LxWxT). Recommended phone size is 4.7-5.9 inch.