But can they talk to each other? Also see Nest and Alexa working together (Inside Nest blog) and It’s Amazon Echo’s World, Now Alphabet’s Nest Just Lives in It (Re/code)
"Amazon, the Internet retailer, on Thursday announced two new siblings for the Echo, the voice-controlled household assistant that people address as “Alexa” and that became a surprise hit for the company last year.
One new product, Amazon Tap, is a slimmer, shorter, portable version of the Echo. Rather than requiring an electrical wall connection, the Tap runs off a rechargeable battery. It connects with phones and the Internet through Bluetooth and Wi-Fi. [...]
Amazon also announced the Echo Dot, essentially an Echo without that device’s powerful speaker. The Dot, which will sell for about $90, looks like a hockey puck, and is meant to provide Alexa’s voice functions for existing speaker systems. The Dot connects to those speakers either through a wire or over Bluetooth; after that, it functions as another Echo "Amazon Introduces 2 Alexa Voice-Controlled Devices - The New York Times