It is an earphone jack. I use it at fests, with the mike close to my
chin on a pouch strap.

Bob N9LVU

tom wrote:
I just bought a Yaesu VX5R and the seller included an MH-34 clip-on
microphone. On the under-side of this clip-on mic is a receptacle for a
jack, and I don't know what it's for --- can someone tell me what the
receptacle's for?