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Note: The reason that the collar tags are sized differently for cats versus dogs is because dogs tend to elevate their heads more when using the pet door than a cat will. For this reason, the dog collar tags are a slightly larger magnet to activate the unlocking mechanism. The Dog Mate comes with 2-Large Collar Tags and the Cat Mate models come with 2-Small Collar Tags.
For control in and out see the Solo Automatic Pet Door.
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