Manufactured by Electrospace Systems, Inc., this Remote Control Unit (RCU) was designed for use with the KG-84 family of cryptographic equipment. The RCU provides the capability to remotely operate the front panel controls and indicator status displays of the installed KG- 84 equipment for distances up to 1,000 feet. Units of this type are were commonly utilized aboard ships and aircraft where console space was at a premium. Dimensions are: 7.75" by 6.75" by 5.0"
KG 84 RCU's came in two variants:
RED FILL DEVICE p/n 83 14001-001
BLACK FILL DEVICE p/n 83 14002-001
[Description and photos supplied by <firstname.lastname@example.org> while these units were up for auction on ebay.com]
KG-84 RCU nampleplates. (Photo via E-bay)