Most bad microphones on sirens are either bad PTT switch(5%) or bad microphone cartridge or element(95%)

Whelen microphone in picture 2 not included just shown for example

This kit allows you to replace the cartridge easily

Remove the three screws from back of mic

Open and remove old cartridge in center

Cut wires at cartridge

Splice new cartridge wires on and crimp white butt splices by flattening with regular pliers

You're done, takes less than 5 minutes

This 600 ohm cartridge will work on all Whelen 295 series sirens and most other manufactures that use a dynamic microphone

Will not work with Whelen Cencom or any other condenser powered microphones

Includes cartridge with 6" leads and 2 b splices