You can plug this custom made lavalier microphone directly into the Whole House FM Transmitter 3.0 and broadcast your voice live to any FM Radio in the area. Just imagine it, with the ability to plug in a microphone You can now be your own DJ for a party Make your own radio show for fun (my kids love this option!) Use it for a presentation or speech, Or have it as a backup system just in case your main audio system or wireless mic dies or goes bad. You’re only limited by your imagination! This is a custom made lavalier microphone and has a male 2.5mm mono input plug.