FOV90° large field of view Adopt imported PMMA material optical lens and unique optical structure, bring 90° big Angle of view, close to the real Angle of view of human eyes. Product parameters: Size & weight: size 140* 184*110mm (excluding headband) Mobile phone configuration requirements: operating system IOS9.0 or above /Android4.0 or above Screen size: 4.5 to 5.5 inches Resolution recommended 1920* 1080 and above Product specification: free surface reflector optical lens Angle of view 90° +