Upgrade your dash cam's rear camera footage with the TILLMANER CPL (Circular Polarizing Filter). Designed specifically for dash cam rear cameras, this 37mm CPL filter effectively reduces glare and reflections from non-metallic surfaces such as glass and water, delivering clearer, sharper images with enhanced color saturation. Whether you're driving through bright sunlight or navigating wet roads, this filter helps ensure your rear camera captures crisp, high-quality video at all times. It also doubles as a protective lens cover, shielding your dash cam's lens from dust, scratches, and debris. The compact design measures 31mm x 31mm with a 43mm outer diameter and a 23.5mm x 23.5mm lens opening, making it a precise fit for compatible rear cameras. Installation is straightforward: clean the camera surface, slide the filter onto the camera aligning the positioning grooves, secure with the included positioning stickers, mount in your vehicle, and simply rotate the front end to dial in the optimal polarizing angle. Note that the camera bracket is sold separately. A smart and practical accessory for any driver looking to improve rear camera clarity and protect their investment.