Next time your doorbell rings, wouldn't it be nice if you could look at your smartphone and see who's there? Siminoff thought so, so he rigged Compant Ring Doorbell Company Sold Wi-Fi-enabled camera outside his door. In his case, it was something of a necessity, since he spent his days in his garage trying to dream up new product ideas, and couldn't hear the doorbell from there.

But when his wife said it Iowa Brewing Company Cedar Rapids her feel safer, he realized he'd hit on a great new startup idea. But getting a hardware company off the ground is tough, and a year later, when he landed a coveted spot on Shark TankDoorBot was close to running out of money. But then the segment did air, and it brought a huge increase in sales that continues to this day, plus lots of interest from investors including Richard Branson.

Amazon seems to be racing to compete with Ring Doorbell Company Sold and Nest for the smart home market, and acquired another smart doorbell company, Blink, in December. It also invested in Ring last year through its Alexa fund, and Ring created an Alexa skill, allowing users to interact with the Ring doorbell through their Amazon Echo devices. As for Siminoff, he Dlorbell seem to have made any public statements since the news broke. He's probably off celebrating somewhere.

Like this column? Sign up to subscribe to email alerts and you'll never miss a post. The opinions expressed here by Inc.