Ring Wi-Fi Enabled Video Doorbell in Satin Nickel, $99.99, available at Amazon
This smart video doorbell gives homeowners peace of mind about who's at their door, whether they're at home or not. When Ring founder Jamie Siminoff appeared on the show, he valued his company, then called DoorBot, at $7 million.
Since then, it's counted prominent investors like Kleiner Perkins Caufield Byers, Qualcomm Ventures, Goldman Sachs, and Richard Branson among its supporters. Most recently, Amazon bought Ring in a deal worth over $1 billion, a testament to its versatile capabilities beyond home security.