Wheel Witness HD PRO Plus Owner's Manual page 6

3. Remove the protection tape from
the Suction Cup and onto windshield.
(We recommend to clean the
installation area with rubbing
alcohol). Then securely lock it.
Usually the best result is when the camera
is installed near the top of the windshield
behind the rearview mirror. The camera
lens has to be closest to the glass for
prevent reflection.
4. Loosen the adjusting knob and
adjust the camera for the best
viewing angle. Make sure to tighten
the knob so the camera is securely
locked in place.
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