So many times on HF, I monitor with the external speaker and the hand mic. Many times, I find myself switching between the hand mic and my Pro7 head set. I wanted a mic switch and didn't know MFJ had one. This little gem worked out of the box, no problems. On the back side are the audio in/out. It's possible to use your favorite mic on a different radio by adjusting the jumpers on the board. I used an audio splitter to send it to the speaker and the head set. A simple push of that little red button sure beats swapping mics any day. This MFJ 1260 is a keeper.