This control module holder is for aviation headsets with a control unit and gelps by holding the unit in a fixed position. It is built to also hold the headset when not wearing them to keep the cockpit organized. I am working on different unit variants allowing a wide variety of headsets. So far I have it for the Bose A20 and Bose ProFlight 2. Special requests can be sent through the contact form on the website. These are built when ordered and can also be personalized as well.