This is a one plug (AXR-5-12) version of Plantronics popular MS50 Series boom-mike aviation headset, specially designed for Airbus A310, A320, A330 Aircraft only. AVIATION HEADSETS ARE SPECIAL ORDER ITEMS AND MAY TAKE AS LONG A 6 WEEKS TO SHIP. CALL 800.641.6416 FOR AVAILABILITY.
MS Series Datasheet
Aviation User Guide