Today Amazon took the wraps off a tremendous pile of Echo and Alexa-related hardware. Chief among the standalone Echo devices are the redesigned Echo Dot, Plus, and Show, as well as a slightly mysterious invitation-based Echo Auto. As expected, they're mostly incremental improvements, with better and louder sound or added Zigbee hub functionality.

Amazon's Alexa is one of the most popular and widely used digital assistants out there, and now it has a whole new generation of hardware available for pre-order. Let's take a look at each individually.

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