Flush-mounted plug socket • having a central plate having a plug socket receptacle, • having a plug socket base connected to the central plate, on the bottom side of which plug socket base a separate power supply unit module can be mounted for the supply of energy to/charging of a mobile audio or communication device, • wherein the power supply unit module has a module housing composed of an electrically insulating plastic having a dome, on the end surface of which a USB port is arranged, which USB port is accessible from the outside by means of an opening introduced in the central plate next to the plug socket receptacle, • wherein contact springs of the power supply unit module engage into contact-making openings of terminal chambers of the terminals, which are located on the plug socket base, for the external wiring to the phase conductor and to the neutral conductor of a 230-V AC voltage network, • wherein the power supply unit module is secured to the plug socket base by means of a plurality of latching hook /latching edge connections, • wherein a printed circuit board of a power supply unit is provided in the module housing of the power supply unit module, which printed circuit board serves for mounting and electrically connecting components of the power supply unit/charging device, wherein the contact springs are in electrical contact with conductor tracks of said printed circuit board, the contact springs in electrical contact with conductor tracks of the printed circuit board engage through the contact-making openings of the terminal chambers of the terminals and, in the interior of said terminal chambers of the screw-less terminals, enter into contact with terminal springs serving for securing conductors, wherein electrical lines connected to the conductor tracks of the printed circuit board lead through the dome to the USB port. • having a central plate having a plug socket receptacle, • having a plug socket base connected to the central plate, on the bottom side of which plug socket base a separate power supply unit module can be mounted for the supply of energy to/charging of a mobile audio or communication device, • wherein the power supply unit module has a module housing composed of an electrically insulating plastic having a dome, on the end surface of which a USB port is arranged, which USB port is accessible from the outside by means of an opening introduced in the central plate next to the plug socket receptacle, • wherein contact springs of the power supply unit module engage into contact-making openings of terminal chambers of the terminals, which are located on the plug socket base, for the external wiring to the phase conductor and to the neutral conductor of a 230-V AC voltage network, • wherein the power supply unit module is secured to the plug socket base by means of a plurality of latching hook /latching edge connections, • wherein a printed circuit board of a power supply unit is provided in the module housing of the power supply unit module, which printed circuit board serves for mounting and electrically connecting components of the power supply unit/charging device, wherein the contact springs are in electrical contact with conductor tracks of said printed circuit board, the contact springs in electrical contact with conductor tracks of the printed circuit board engage through the contact-making openings of the terminal chambers of the terminals and, in the interior of said terminal chambers of the screw-less terminals, enter into contact with terminal springs serving for securing conductors, wherein electrical lines connected to the conductor tracks of the printed circuit board lead through the dome to the USB port.