Hi Harvey, I don't have one of those radios yet but my standard radio has a button on the microphone that turns off the squelch if you are on simplex. If you are on a repeater, it will put you on the input and opens the squelch. I hope that is what that button does it is a good feature. 73 Walt and GEB dog Opus WA4QXT New London CT [log in to unmask]