Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 2124 found under Headset Microphone by Unex A Dynatech Co. The National Stock Number assigned to this part is 5965014465996, and the Federal Supply Class is 5965 Headsets Handsets Microphones And Speakers. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 2124.