COMPATIBILITY: It is compatible with IOS and Android operating systems and with cell phones that measure 4" and a maximum of 5.7" so that they fit perfectly inside the glasses. INNER LENSES: It has internal lenses of the latest technology that amplify the images of your cell phone, whether you have it in camera mode or in a virtual reality video. WINDOW: It has a window to free up your cell phone camera to capture the amplified and immersive view around you and use virtual reality applications compatible with your mobile device. FREEDOM OF MOVEMENT: You can easily move around and still enjoy 3D viewing as you don't need to be holding the VR headset. SAFE: It has a lock at the top to prevent your smartphone from falling.