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This is the first digital door viewer of it's kind in our product catalog. The digital door viewer works with the standard peephole provided in the kit and installs in minutes. A simple push button activates the LCD screen without darkening the peephole. The unit compansates for both low light and the "fish eye" distortion...AND it has a zoom feature! The viewer shuts off automatically after 10 seconds to save your batteries. For more information and ricing click here.