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GY-MAX4466 Adjustable Gain Highly Sensitive Microphone Board 2.4-5V DC (GY-MAX4466 microphone)
Add an ear to your project with this well-designed electret microphone amplifier. This fully assembled and tested board comes with a 20-20KHz electret microphone soldered on.
130A High Precision DC Watt Meter And Power Analyzer (DC Power analyzer)
We found this little unit great to measure our incoming solar power versus outgoing battery load on a second unit