The term Amazon Speaker Brand is a crossword solution that refers to the ECHO, a 4-letter word. The ECHO is a line of smart speakers developed by Amazon.com, Inc. It uses the Alexa Voice Service to play music, provide information, news, sports scores, weather, and more. The ECHO also has the ability to control other smart home devices. The ECHO was first released in 2014 and has since become one of the most popular smart speakers on the market.