This 40mm CPL filter is used for Vantrue N5, N5S, N4 Pro,N4 Pros, N4S, S1 Pro,S1Pro Max, E1 Pro, N2X, E1 Lite, E2 Dash Cam. Note: It doesn't work for Vantrue E360. It can effectively reduce reflections, enhance contrast and boost saturation while retaining neutral color rendition in all your shots. Aluminum alloy CNC non-slip design, easy to install and remove the filter. Super slim 5.5mm rim profile greatly avoids vignettes on wide-angle lenses. Multi-resistant coating, anti-scratch, anti-fingerprint, anti-static, oil-resistant and water-resistant. Vantrue 40mm Ultra-Slim CPL Circular Polarizer Filter for E1 Pro, N5(S), N4 Pro(S), S1 Pro, E1 Lite dash cam, E2, front lens, Reduce Glare and Reflection, Enhance Contrast