Small to Big: SureFlap, the Pet Door With Microchip Access

“If anyone has a bad experience, the first thing they’ll do is post it online”
Illustration by Dorothy Gambrell

Sick of strays wandering into his home through the cat door, Nick Hill developed an electronically activated flap that responded only to his kitty. The British physicist’s invention was a hit: More than 250,000 SureFlaps have been sold since 2008. A version for small dogs is in the works.

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