Amazon Echo Dot (B7W644)

Overview
"30-005605" and "REV 01" are silkscreened on main board.

Hardware specification

 * CPU: MediaTek MT8512B @2.0GHz
 * Dual-core ARM (Cortex-A53)
 * Amazon AZ1 Neural Edge


 * Storage: 512MB (SPI NAND) Flash
 * Memory: 512MB (LPDDR4) RAM
 * Wi-Fi: MediaTek MT7653BSN (SDIO)
 * 802.11abgn/ac 2.4/5GHz + BT 5.0


 * Power Source: 12V 1.25A via barrel

Links of Interest

 * Amazon Echo Dot With Clock (4th Gen) Review on PC Mag
 * Amazon Echo Dot with Clock (2020) review on TechRadar
 * Amazon Echo Dot & Echo Dot with Clock (4th Gen) review on Android Central