Earphone Connection EP534-PTT Tactical Ear Gadgets QUICK RELEASE ADAPTER and PTT for APX radios APX4000 APX6000 APX7000 APX8000 Replacement quick-release adapter EP534-PTT. Works with Earphone Connection microphone kits such as the Hawk, Snake, Etc.. Built in Push To Talk button. Works with Motorola XPR Series and APX Series radios.