My installation was on a 1-3/4" thick door. I found the optics were sharper and more focused with the beep turned down to about 2". First got I left a negative review and they sent me a new device. It's the same. Then why 5 stars? Because I realized it was my glasses and not the device. I apologize for the first review. I have added a photo of the actual view through the unit installed on my door. The camera clearly has a better eye than me. Pros: Clear, sharp image with good viewing angles Cons: On thin doors like my 1-3/4" door it seems to have lost some of its sharpness its due to my prescription glasses.
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