When we bought a house in the country we decided we needed a door for our cat that would keep other animals out. After digging around the internet, we decided to try the catwalk model. Batteries don't age. I pulled the window out of the basement and replaced it with a piece of Plexiglas. I cut a hole in the plexiglass with a Dremmel and a cut-off wheel, one for the cat door and one for the dryer vent. I chose the basement window under the porch so I don't have to worry about snow blocking the door in the winter. I live in upstate New York. I should note that I bought a multi-magnetic glass mount model. It's the same as above but with a rounded edge. Also, make sure you get the one you want. They have standard and multimagnetic models. Standard models do not include other animals, they only have a magnet to help close the door. They even have a clear model for installing glass, but it's NOT multimagnetic. So far it has worked very well. I can't say it's completely raccoon proof; a raccoon could stick its little fingers through the door and open the door. However, this makes it much less likely than a standard door. This is to deter stray cats, of course. My cat lost his collar and magnet when it rained and I'm sure he struggled to get in. When we got home we found him soaking wet on the street. Cats always lose these things. Make sure you cut a hole big enough, don't try to fit it into a hole that will snap or it won't close properly. I also had to cut the weatherstrip on the top sides of the door a bit to keep it from sticking out ajar. The door should be made of durable plastic. Sounds like good plastic, but the main reason this door doesn't break like cheaper doors is because of the design. The hinges are stronger than other cat doors. Multi-lock disk can be set for entry and exit, entry only, exit only and locked. Unlike cheaper doors, the dial stays where you set it and doesn't move to a different position. All in all a well thought out, well made product. UPDATE 01/18/2009: It's been about a year and a half with two cats and it's still working great.
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