6 Pieces Electret Microphone Amplifier Module MAX4466 Adjustable Gain Blue Breakout Board

Sounds great, works well. I modified the circuit to provide a high-pass "pre-emphasis" for use with an AM transmitter. Circuit below:

Wanted a voice activation solution outside having to come up with a Java solution in Android, but didn't have enough resources on ESP32C3 to handle voice recognition well. Settled on a "whistle trigger" (using Goertzel constants; frequencies matching whistling on a b-flat scale triggers current on different I/O pins) instead. This worked out reasonably well, though I was foiled again by ceiling fans. Struggled to get consistent readings; eventually realized I had a ceiling fan pointed directly at the microphone; things were fine after turning off the fan.

The product overall is a very nice one - I wish the headers were pre-soldered, but that's not a dealbreaker. Dealing with Analog Signals, especially if you're utilizing something like CircuitPython is a bit more trouble than it's worth. You can grab I2S Microphones for a similar price and quantity for a much smoother experience.

Solid little microphone without too much markup over direct-from-china shipping. I used them for capturing audio signal levels and the sensitivity and calibration have been good on each of the ones I've tested, but I can't speak to their frequency response.

Had no issues getting these to work for my project. Have bought others and they wouldn't work. I've used 3 so far and not one problem.

The item is new and defective! First item DOA

Two were bad, but it was relatively inexpensive so i just ate the cost

They worked for what I needed them for.