Online retailer Amazon (AMZN) is embracing its inner tech geek with the introduction of two new technology products, hoping to further capitalize on its surprisingly popular home-based voice-controlled Echo product that has been dubbed, Alexa. In this March 2, 2016 photo, David Limp, Amazon Senior Vice President of Devices, center, speaks behind an Amazon Echo in San Francisco. Amazon.com is introducing two devices, the Amazon Tap and Echo Dot, that are designed to amplify the role that its voice-controlled assistant Alexa plays in people's homes and lives. Corrections & Clarifications: An earlier version incorrectly identified Amazon's Fire Phone. SAN FRANCISCO -- The Amazon Echo is turning out to be a sleeper hit.

The Amazon Echo is turning out to be a sleeper hit. The stand-alone, voice-activated digital assistant is on back order, it was cited when premium speaker maker Sonos announced layoffs and it appears to be prompting other device makers (think Google's Nest) to work on their own look-alike services.

USA TODAY's Ed Baig tests Amazon Echo's personal digital assistant. It's not an easy product to get and you have to wait for an invitation to buy the product. Find out how Alexa relates to Siri, benefits and flaws. In this March 2, 2016 photo, David Limp, Amazon Senior Vice President of Devices, center, speaks behind an Amazon Echo in San Francisco. Amazon.com is introducing two devices, the Amazon Tap and Echo Dot, that are designed to amplify the role that its voice-controlled assistant Alexa plays in people's homes and lives.