Multifunction CPL Filter: To prevent overexposure, the polarizer can be used as a gray filter, which can reduce the light transmittance of the lens without affecting the normal color reproduction of the work. | Clip-on Design: Universal clip-on design, easy to secure lens firmly on your device. Portable and detachable, you can take pictures with your devices at any time during traveling. | New design universal clip can attach any 37MM Thread Digital SLR Pro Lens on your mobile,With the 37mm thread clip, different camera lens filters fit for smartphones, | The movable circular polarizer can reduce glare and display more realistic colors. Take more amazing photos of people, pets, travel scenery, landscapes, buildings, selfies and more. | Note:Since the natural light vibrates evenly in all directions, and the polarizer leaves the light passing through only a certain vibration direction,it can effectively reduce the reflection of water, glass, etc. At the same time, the polarizer can also make the sky bluer and the clouds more abundant!