This Tactical Interface Module operates in push-t-talk mode exclusively. Motorola Tactical Audio Accessories were designed with a high-performance interface enhanced by a high-speed Digital Signal Processor (DSP), which only detects the human voice. This allows communication in voice-activated mode without the microphone being activated by ambient sounds. This interface module connects to your APX radio and to a variety of bone conduction devices allowing you to create a complete solution in critical environments. The tactical audio accessory must be ordered separately.