The 3M PELTOR External PTT, FL5602-50 plugs into the WS LiteCom Pro III Headsets and includes a Push-to-Talk (PTT) button for convenient positioning and activation. The combination of the intrinsically safe model of the 3M PELTOR WS LiteCom Pro III Headset and FL5602-50 External PTT is certified to be intrinsically safe for use in potentially explosive atmospheres.