The electronic door peephole viewer uses a color screen on the inside of the door and is mounted instead of the usual door peephole viewer. Pressing the button under the color screen gives a sharp, clear picture of the person standing outside the door. Pressing the button a second time when the screen is on switches to zoom mode.
Door peephole viewer is easy to install.
Model: Brinno, digital door eye
This electronic door peephole viewer increases peace of mind for the user. She reminds her children to use it too.
Today there are many more models that are also less expensive.
Brinno, brinno.com (last checked June 2017)
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This tip is from 2015