A configured device in the form of a printed circuit board. All you need to connect a microphone, power and connect to the transceiver.
The 5 upper tuning resistors are the equalizer. The others are Microphone Amplifier, Compressor and Audio Output.
How to connect to the transceiver is shown in the figure. The current consumption is 8mA, so it is suitable for any transceivers.
If you use transceivers from Yaesu, they have 5V power supply at the microphone connector. It is necessary to install a jumper on the stabilizer as shown in the figure
One of the implementation options is shown in the photo. You can also use a case to protect the board and for an aesthetic appearance.