Reduce Glare | Reduce Reflection | Enhance Contrast Compatibility – This CPL filter is used for Rexing R4 dash cam. Note: It doesn't work for other Rexing dash cams. Usage – It can effectively reduce reflections, enhance contrast and boost saturation while retaining neutral color rendition in all your shots. Simple Installation – Aluminum alloy CNC non-slip design, easy to install and remove the filter. Super slim rim profile significantly avoids vignettes on wide-angle lenses. Reliable Design – Multi-resistant coating, anti-scratch, anti-fingerprint, anti-static, oil-resistant, and water-resistant.