We use the screamingbee voice changer. It works great! We connect the microphone to the laptop that runs our simulator, so it is not exactly wireless, but it works well. Make sure to set the computer so the sound runs through the screamingbee program or it will not work (the screamingbee program will need to be open whilie you run the simulator). You will also want to make sure that you have "listen" turned off, or you will get an echo through your simulator. There is a bit of a delay as it changes your voice, but if you are far enough from the simulator it is not too distracting.