Sources:
www.washingtonpost.com/news/the-switch/wp/2017/12/07/amazon-wants-a-key-to-your-house-i-did-it-i-regretted-it/?utm_term=.fbe544be0578
thespoon.tech/amazon-key-adds-more-connected-lock-options-from-yale-and-kwikset/
www.usatoday.com/story/news/2017/10/25/new-amazon-key-lets-delivery-driver-leave-packages-inside-front-door/796/80001/
www.businessinsider.com/how-amazons-in-home-delivery-works-2017-10