Speaking tubes; telephone receivers; tape recorders; cabinets for loudspeakers; diaphragms (acoustics); loudspeakers; audio- and video-receivers; megaphones; microphones; sound transmitting apparatus; sound recording apparatus; horns for loudspeakers; acoustic couplers; camcorders; personal stereos; headphones; earphones; chargers for electric batteries; accumulators, electric; portable power supply apparatus (batteries); smartphones; mobile phone cases