Plug-in adapter allows you to input a 3.5mm audio source (Phone, MP3 player, iPod, etc.) into your tactical communications headset while still staying connected to your tactical radio - Allows music to only play through the operator's headset rather than broadcasting to everyone connected to your communications network - Standard NATO-US / U-174 / U-93 / Nexus TP-120 / 1/4" plug and socket for connecting to headset and PTT, 3.5mm plug for connecting to music source - Standard Military / NATO wiring format (mic-, ear+, mic+, ear-) - Made by Armorwerx (a division of The Mercenary Company)