Flush-mounted socket outlet, consisting of a central plate, a socket-outlet base and a cover frame, • wherein the central plate has, in its centre on the front, a socket-outlet recess and, in its edge region, a USB connection, • wherein an insulating housing for the USB connection is fastened to the back of the central plate, in which insulating housing a USB printed circuit board which is used for the electrical connection of the USB connection is integrated, • wherein end-face USB contacts of the USB printed circuit board penetrate the insulating housing, • wherein a power supply unit connectable on the primary side to the 230 V AC voltage power supply system is integrated in the socket-outlet base, said power supply unit having a power supply unit printed circuit board, which is populated with electrical/electronic components, for supplying energy to/charging a mobile audio or communication device, wherein the control plate of the flush-mounted socket outlet 1 having the USB connection 9 arranged at the edge of the socket-outlet recess 4 is fastened to the socket-outlet base 14, • wherein a spring pin contact device having a spring pin housing with spring pins is mounted in the socket-outlet base in such a way that first spring pin contacts, when the flush-mounted socket outlet is completely assembled, come into electrical contact in a spring-loaded manner with the USB contacts and second spring pin contacts come into electrical contact in a spring-loaded manner with conductor tracks of the power supply unit printed circuit board, • wherein, for this purpose, the insulating housing enters a contact space formed in the base housing of the socket-outlet base, in which contact space the first spring pin contacts are accessible and contactable. • wherein the central plate has, in its centre on the front, a socket-outlet recess and, in its edge region, a USB connection, • wherein an insulating housing for the USB connection is fastened to the back of the central plate, in which insulating housing a USB printed circuit board which is used for the electrical connection of the USB connection is integrated, • wherein end-face USB contacts of the USB printed circuit board penetrate the insulating housing, • wherein a power supply unit connectable on the primary side to the 230 V AC voltage power supply system is integrated in the socket-outlet base, said power supply unit having a power supply unit printed circuit board, which is populated with electrical/electronic components, for supplying energy to/charging a mobile audio or communication device, wherein the control plate of the flush-mounted socket outlet 1 having the USB connection 9 arranged at the edge of the socket-outlet recess 4 is fastened to the socket-outlet base 14, • wherein a spring pin contact device having a spring pin housing with spring pins is mounted in the socket-outlet base in such a way that first spring pin contacts, when the flush-mounted socket outlet is completely assembled, come into electrical contact in a spring-loaded manner with the USB contacts and second spring pin contacts come into electrical contact in a spring-loaded manner with conductor tracks of the power supply unit printed circuit board, • wherein, for this purpose, the insulating housing enters a contact space formed in the base housing of the socket-outlet base, in which contact space the first spring pin contacts are accessible and contactable.