![](http://i110.photobucket.com/albums/n114/corsiphoto/photos-part2/dog-41.jpg?t=1218742964)
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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