Earphones; Loudspeakers; Megaphones; Microphones; Radios; Semiconductors; Subwoofers; Audio-video receivers; Audio equaliser apparatus; Audio mixers; Cabinets for loudspeakers; CD players; Dictation machines; DVD players; Electrical pickups for use with musical instruments; Electronic educational apparatus, namely, communication blocks that manipulate and convey information electronically based on their arrangement and are used for cognitive development in disciplines such as counting, spelli...