This is the patented pet door that automatically unlocks its flap only when a pet with a "smart key" approaches, giving your dog or cat unlimited freedom of passage while prohibiting unwanted animals from gaining entry.The smart key attaches to a pet's collar and transmits a coded signal that activates a spring release in the door, allowing your pet to push through the flap. Approximately 15 seconds after your pet moves beyond range, the door automatically re-locks.$249.95 at Hammacher Schlemmer(via the green head)
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