The instructions said to test before installing. In my experience with this product I worried for nothing. The camera and monitor worked right out of the box. Climbing a ladder to replace the existing camera would have been a royal pain if it was installed and found not to work. So good advice. As soon as I connected 12V DC to both the camera and monitor it just worked. I'm not sure I should include this other product in this review but, save yourselves a load of trouble and get some 12V DC power supplies. I could hook up and test all features from my kitchen table. More of this review on that product.
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