Swinging pet doors are great, but they often welcome unwanted guests. A new breed of door arms your pet with an electronic key: A 1- to 2-ounce device attached to Killer's collar alerts a sensor in ...
Alina Bradford has been writing how-tos, tech articles and more for almost two decades. She currently writes for CNET's Smart Home Section, MTVNews' tech section and for Live Science's reference ...
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