Audio- and video-receivers; Audio interfaces; Cabinets for loudspeakers; Converters; Data processing apparatus; Data processing equipment, namely, couplers; Portable media players; Sound transmitting apparatus; Transponders; Virtual reality headsets; Wearable video display monitors; Wide-angle lenses for cameras; Acoustic separation units; Audio equaliser apparatus; Audio equalizer apparatus; Cable television converters; Closed circuit TV systems for security and surveillance, namely, cameras...