Code Red Communicator Headset Accessory. 5mm For Iphones Or Mobile Devices Using A 3.5mm Connection. The Mrc-nx-3.5 Adapts The Codered Nx And Pro Series Headsets For Use With Iphone (with Lightning Adapter) Or Any Device That Uses The Pc Headset 3.5mm Interface. Also Works With Military Style Headsets That Use The Nexus Tp-120 Connector Wired To The Us Nato Standard Including Some Peltor And Msa Sordin Headsets. Package Contents: Code Red Mrc-nx-3.5 Code Red MRC-NX-35: MRC-NX-3.5 Communicator Headset Accessory