Amazon Key allows couriers to open your door with a simple swipe on their smartphone after scanning a barcode. Their moment of entry is videotaped via Amazon's new Cloud Cam, which is part of a $249.99 bundle that includes a smart lock and free installation. Amazon Key can also be used to let housecleaners or friends and family into your home as well. Prime customers can preorder the bundle now, with the Key app and delivery service launching on November 8 in 37 U.S. cities. What do you think?