Active and Passive Buzzer for Arduino, ESP8266 and ESP32
DIY Wifi Audio Notifier for ESP8266: Play MP3, TTS & RTTL (Cloud-free) : 7 Steps - Instructables
Amazon.com: ACEIRMC ESP8266 ESP-12 ESP-12F NodeMcu Mini D1 Module WeMos Lua 4M Bytes WLAN WiFi Internet Development Board Base on ESP8266 ESP-12F for Arduino,Compatible with WeMos D1 Mini (10pcs) : Electronics
Wifi Audio Notifier using ESP8266: Play MP3, TTS & RTTL - YouTube
Amazon.com: ACEIRMC ESP8266 ESP-12 ESP-12F NodeMcu Mini D1 Module WeMos Lua 4M Bytes WLAN WiFi Internet Development Board Base on ESP8266 ESP-12F for Arduino,Compatible with WeMos D1 Mini (10pcs) : Electronics