Audio- and video-receivers; Audio interfaces; Banana plugs; Cable connectors; Connections, electric; Connectors for electronic circuits; Data processing equipment, namely, couplers; Electric switches; Electric wires and cables; Electric and electronic effects units for musical instruments; Electrical header connectors; Electrical outlets; Electrical plugs and sockets; Electrical terminal blocks; Electrical terminators; Light emitting diodes (LEDs); Power connectors; Triodes