Abstract: An electrical connector plug assembly has an outer shell containing at least one electrical contact module acting as an electrical contact plug. The outer shell works in cooperation with a separate connector receptacle assembly which has an inner shell containing at least one electrical contact module acting as an electrical contact receptacle. The outer shell of the electrical connector plug assembly is outfitted with an improved retaining device which secures the outer and inert shells of the connectors together over the joined electrical contact modules within those shells. The preferred connector retaining device is a clip which is attached so that the main body of the clip is in contact with an exterior surface of the plug with extending tabs which hold the clip in position upon slots on the interior surface of the plug and exterior surface of the receptacle shell.