Amazon.com: PRUVEEO Dash Cam, 4 Channel Camera FHD 1080Px4, Front Left Right and Rear, Front and Rear Inside, Built-in GPS WiFi, Polarizing Lens CPL Filter, Free 128GB Micro SD Card, D904CH-MINI :
VIOFO CPL Polarizing Filter for A139 Front Dash Cameras
Rexing Ultra-Slim CPL Circular Polarizer Filter for R4 Dash Cam | Rexing USA
What is a CPL Filter? — BlackboxMyCar
BlackVue CPL Filter — BlackboxMyCar
How to Install the CPL Filter – Thinkware Help Center | Troubleshooting | Tech Support | FAQ