An electrical fixture has a plug or socket of the type including concentric terminal rings, the plug having a spindle that is releasably receivable within a central channel of the socket to form a latch. Either the plug or the socket is attached to a hub having peripheral electrical connectors. Modules can be connected to the hub by the peripheral electrical connectors, the modules including electrical components each having one or more features. The modules are selectable for desired features, including transmitting and receiving, or sensing a condition in the environment, such as a security camera, glass breakage detector, motion/presence detector, and lighting. The hub can include a central circuit board which is electrically connected to the peripherally attached modules. The hub is further connected to electrical wiring of the edifice within which the fixture is installed.