Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 621LZ WITH 502C found under Microphone Dynamic by M And S Electronics Inc. The National Stock Number assigned to this part is 5965010450247, 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 621LZ WITH 502C.