Amazon.com: Made For Amazon, Battery Base in Black, for Echo (4th generation). Not compatible with previous generations of Echo or Echo Dot (1st Gen, 2nd Gen, or 3rd Gen). : Everything Else
Amazon Echo Dot 3rd Generation Review (3rd Gen. vs. 2nd vs. 1st)
Amazon Echo Dot (3rd Gen) White in the Smart Speakers & Displays department at Lowes.com
Amazon Echo Dot 4th Gen (2020) review: have a ball - The Verge
2nd-Gen Echo Dot vs. 3rd-Gen Echo Dot: Which Should You Buy? | Tom's Guide