Hi DonM,
The Shure WH20 can plug into either a keyboard or amplifier (this is what I use) or it can plug into a radio transmitter attached to your belt etc. Working the mic is a training issue. I often lead sing (no keyboard etc) and use just a "hand" mic. This allowed me to develop the skill of working the mic. When I first started to use the headset mic with the 9000PRO I found that this was a hurdle. It's amazing what the body (mind) will adapt to. I have found (I believe)that I can now work the mic "just as well" while using the headset.