The CPL filter is suitable for 70mai A810 Dash Cam. (It's designed for the front cam, not for the rear cam or the interior cam.)
Protect camera lens from finger prints, scratches and dirt destroying.
Minimize reflections and glare coming from glass, metals, or shiny surfaces to prevent any degradation in image quality, similar to the function of polarized sunglasses.
Make colors more saturated It can be used during day time and at night.