Simple to use--1. get 3d video(left-right format)/app downloaded & play(just search "vr" on apple app store/google player, you will find limitless vr apps to choose, recommended: youtube/veer/fulldrive); 2. put cell phone into the vr glasses, wear it and adjust headband, pd & od to get the best 3d viewing effect. you will then step into a new world with endless fun to explore