Connected kit will convert ear protection into communicated earmuffs. Not Recommend to use it separated because of different version of u94 ptt adapter. Made of excellent ABS materials, dulable and stable. Type - kit is compatible with ComTaXPI Comtai tactical headsets. Boom Mic - Compatible with airsoft comta headsets, can be adjusted posittion by your prefer. Note that if sound is not transmitted from the microphone, you can plug the jack in backwards and adjust the position of the positive and negative terminals. K plug PTT - u94 system ptt 2 pin，will compatible with baode-g talkie walkie, z-tac tactical headsets. Installation - Connect the jack of the cable to the jack of the headset correctly, and then connect the intercom to communicate correctly. Connected kit will convert ear protection into communicated earmuffs. Not Recommend to use it separated because of different version of u94 ptt adapter.