Meet the HooToo 3D VR Headset: a wearable device that lets you use your smartphone to experience virtual reality and 3D content. It is compatible with iOS and Android VR apps. You can adjustable focal and pupil settings to get a better experience.
The HooToo headset is compatible with smartphones from 3.5 to 6″. It comes with adjustable straps. You can get yours for under $40.[where to get it]