The Vox feature only works on radios that have Vox. Vox = Voice Activated Switching.
They are still good mics. I run mine on my Cobra 2000, no Vox switching, but it works great in normal mode. It also has a 20db switch that cuts the modulation to almost nothing, not sure where/when that would be used.
But it does have a nice built in single roger beep that goes off at the end of your transmission, also switchable. Standard MC320 cartridge, like all d-104 models. Good microphone, I love mine.. I have no schematic for it and it works good, that's all I know. Vox may require wiring the mic for your specific radio.. Depending on the number of pins for your radio.
I just re-felted the bottom plate on mine and it slides nice..