Abstract: An electrical plug device includes a housing, a cover unit mounted to the housing and a plug module mounted to the cover unit. The housing includes a base wall, a slot forming wall peripherally extending from the base wall, an engaging-groove forming wall peripherally extending from the base wall and opposite to the slot forming wall, and at least one slot formed in the slot forming wall and extending to and meeting the base wall. The plug module extends into the housing and includes a plug member fixed to the cover unit by a fixing unit. The plug member includes at least one plug prong that is movably disposed in the at least one slot to pivot between a folded position and an unfolded position.

Abstract: A string light assembly includes a string light connector and a lighting module electrically connected with the string light connector. The string light connector includes a cable, a plug connected with one end of the cable, and a socket module connected with the other end of the cable. The socket module has a plurality of interface modules of which at least one is used for connecting the lighting module, and at least one is used for connecting a plug of another string light connector. A plurality of the string light assemblies are connected to form a light string by engaging the plugs and the corresponding interface modules of the socket modules thereof with one of the plugs used for connecting to a power source. The string light assembly is designed to facilitate the connection and disconnection between two string light assemblies so as to conveniently adjust the length of the light string.