Salora CDC3350FD User Manual - page 40
Manual is about: Full HD Auto DVR
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b. CPL Installation (Optional)
CPL: Circular-Polarizing Filters, could reduce the reflection of the inside of the car on the car window.
Without CPL With CPL
Install CPL onto the device through the screw
on the device camera.
After the installation of the CPL onto the device and the
installation of the device onto the car window, rotate the
adjustment circle ring on the CPL to get a good
polarized effect.
Adjustment circle ring