how many generations of amazon echo are there
Amazon Echo The second generation of the Amazon Echo Dot became available on October 20, 2016. It is priced lower, has improved voice recognition, and is available in black and white. The Echo Spatial Perception (ESP) technology allows several Echo and Dot units to work together so that only one device answers the request.[citation needed] As of November 2017, the Echo Dot maintained a 78% score on GearCaliber, based on 23 reviews.[37]