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I haven't tried it at night yet but during the day the picture is good enough to see the blind spot right behind the truck.
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It helps since I have a blind spot in the rear side of my convertible when the top is up.
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Not waterproof and once you get even a tiny bit of moisture inside, humidity will cause the moisture to collect dead center of the lens creating a blind spot.
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I have a convertible Mini Cooper and the blind spots are awful and while backing up its always a challenge.
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If your plagued by "blind-spots" and looking for a solution i give my complete recommendation
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It serves as an easy installation spot but it gets covered with snow easily.