Headphones; Loudspeakers; Bar code readers; Cabinets for loudspeakers; Compact disc players; DVD players; Electric door bells; 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, spelling or quantitative; Horns for loudspeakers; Laboratory robots; LCD projectors; Multimedia projectors; Personal stereos; Portable radios; Radios; Swi...