ESP WiFi Spy Microphone (ESP32 and ESP8266) - Hackster.io
Amazon.com: MAX9814 Electret Microphone Amplifier Board Module MIC Auto Gain Max 40dB/50dB/60dB Frequency 2.7V-5.5V with Pins for Arduino : Electronics
MAX9814 Electret Microphone Amplifier Module AGC Auto Gain Control, ESP32 WLED | eBay