Pet doors can be a two-way street: a great option for your pets but a convenient entrance for a neighborhood raccoon interested in a self-guided tour of your digs. But while perusing Unplggd recently, I came across this gem of a gadget: the SureFlap Cat Flap. Using the radio frequencies associated with the microchip already in your cat (or small dog), the door is able to recognize your pet and unlocks only when they’re prepared to use it, keeping unwanted party-crashing to a minimum. As one veterinarian notes on the SureFlap site, mounting it in a wall can also be a foolproof way to separate indoor cats at meal times. So what do you think, readers? Is it time to upgrade? — Sarah C.