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Title: Total waste of money.
Review: Huge waste of money. My dog has to stand still in exactly the right place for this to work. I took the collar off the dog and tried to get it to open myself and I even had a hard time getting it to work. Very disappointed because in addition to purchasing this, I also paid a contractor to cut a hole in my new siding and drywall to install it. Now it is just sitting there as part of the wall and completely non-functional.
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