CB-13 Portable PTT -----Push to Talk Switch
Aviation headsets typically are not equipped with integral push-to-talk buttons. This is because most modern airplanes have push-to-talk buttons built in to the control yoke.
"pre-headset era" do not have this convenience feature.The solution is to add a portable PTT, "strap on" push-to-talk button with plug in connections. These can be moved from one airplane to another, very rapidly, so they are ideal for renters.