Amazon.com: Made for Amazon Battery Base, in Black for Echo Dot (4th generation) Not compatible with previous generations of Echo or Echo Dot (1st Gen, 2nd Gen, or 3rd Gen). : Everything
The Echo (4th Gen) | With Premium Sound, Smart Home Hub, and Alexa | Charcoal - Walmart.com
Amazon Echo Dot (2020) Fourth-Generation Review: Alexa on a Budget