Amazon Echo (4th Gen) With premium sound, smart home hub, and Alexa Glacier White B07XKF75B8 - Best Buy
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
Amazon unveils its 4th-generation Echo - The Verge