Amazon.com: HiLetgo 1PC ESP8266 NodeMCU CP2102 ESP-12E Development Board Open Source Serial Module Works Great for Arduino IDE/Micropython (Small) : Electronics
Voice Based Home Automation with NodeMCU & Alexa
Home Automation App Development | Io Controller Home Automation - Alexa Voice/app - Aliexpress
Alexa (Echo) with ESP32 and ESP8266 | Random Nerd Tutorials