The Plantronics MS250 commercial aviation headset leverages a proven design to set new standards in comfort and reliability for pilots. The noise-canceling microphones enable clear, uninterrupted communications between air and ground. The over-the-head design offers a stable fit for extended wear. MS250 Models and Part Numbers: MS250 P/N 92380-01 (2 Plugs; one each PJ055 and PJ068) MS250-1 P/N 92390-01 (1 Plug; PJO68) MS250 for Airbus P/N 92702-01 (1 Plug; XLR5).