Meet the Opto VR headset: a portable device with built-in audio that lets you use your smartphone to experience movies, games, and photos. Opto is simply to use. Just remove the front cover, insert your phone, connect the audio, and put the cover back on. Opto works with smartphones between 4 to 5.1 inches.
Opto comes with a magnetic cover. It will be available in various colors. You can find out more here.