1. Plug: Military Standard Plug. 2. Function: Noise Reduction,active-volume hearing protector. 3. Support: Fit Ztac PTT. 4. Communication: Wired. 5. Connectors: 7mm. With Military NATO Standard Plug [ Support PTT (push-to-talk)] NOTE : PTT accessories are not included. If you want to use it for communication, you need to connect it with the PTT (push-to-talk), then connect the radio.