This is a 1000 ohm earphone used in mk-1697/g with combat vehicle crew members helmets
NSN 5965-00-644-0339
NSN 5990-01-142-0538
NSN 5996-01-133-8211
NSN 6685-01-113-6897
NSN 4140-01-527-7878
NSN 6645-00-551-8291
NSN 6145-01-157-2042
NSN 6135-01-251-2095
NSN 6220-00-020-5028
NSN 6110-01-370-7371
NSN 6145-01-611-7640
NSN 6610-01-413-3912
Last Updated: 02/28/2025