Security startup Bot Home Automation said it had raised $4.5 million to fund its Wi-Fi-enabled video doorbell called DoorBot, which streams live video of visitors to a person’s device.

The company declined to disclose its investors.

DoorBot and its inventor, Jamie Siminoff, first hit waves on ABC’s “Shark Tank,” a reality TV show for entrepreneurs hoping to wrangle in investors, but failed to raise money through the show. After the episode aired in November, DoorBot announced it had raised $1 million in seed funds from several investors including First Round Capital and Upfront Ventures.

“The way these products sell is by word-of-mouth,” Siminoff said. “You can get into as many stores as you want, but to really be the next Dropcam, next Apple, next great consumer product company, you really need to deliver a phenomenal customer experience.”

Siminoff, Bot’s 37-year-old chief executive, has launched a handful of other start-ups, including Unsubscribe Inc., which helps consumers unsubscribe from unwanted email, and design lab EdisonJr.

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Staff reporter Melissah Yang can be reached at [email protected]. Follow her on Twitter @MelissahYang for the latest in L.A. tech news.