Devices for recording, transmission and reproduction of sound and images, namely, loudspeakers, loudspeaker systems, music systems comprised of base stations, speakers, microphones, sound bars, subwoofers, headphones, headsets, namely, for use with cellular or mobile phones, computers or handheld digital electronic devices or for video and telephone conferencing, microphones, conference systems comprised of telecommunication base stations, telecommunications headsets and headphones, telecommunications microphones, telecommunications cables, speakers, charging stations, batteries, amplifiers and sound receiving apparatus in the nature of audio receivers and sound reproducing apparatus; electrical, electronic, signal and monitoring apparatus, namely, electrical transducers, HF receivers, HF input modules; receiving apparatus, namely, audiovisual receivers, electronic monitor modules for monitoring electrical signals for sound balancing; apparatus for transmission of acoustic information, namely, microphone transmitters, microphone receivers, headphone and headsets transmitters, headphone and headsets receivers, telephone transmitters, telephone receivers; electro-acoustical and visual, identifiable guide systems comprised of sound signal receivers, audio transmitters and headphones for providing information in single or multiple language formats for use in museums, exhibitions, theatres, and other public events; apparatus for broadcasting, transmitting and receiving sound signals or video signals, namely, transmission apparatus in the nature of pocket transmitters, pocket receivers, audio receivers, radio transmitters; intercoms for conference calls, telephones, and computers; portable and handheld digital electronic devices for recording, organizing, transmitting, manipulating, and reviewing text, data, image and audio files; chin-strap audio receivers; microphone capsules, microphone modules, microphone protection sleeves; ear pads especially adapted for use with headphones, electrical controllers in the nature of volume controls, amplifiers, batteries, battery chargers, cable connectors; USB charging ports; pre-recorded magnetic data carriers featuring computer programs for use in creating and editing music and sound effects, and for use in controlling and improving sound quality of computer and audio equipment; blank recording discs; blank compact discs; blank DVDs; other blank digital data carriers, namely, floppy disks, videos, USB flash drives, cards for storing data; computer software to control and improve audio equipment sound quality and for operating, installing, testing, diagnosing and managing devices for wireless transmission of acoustic information; downloadable mobile applications for telecommunications apparatus for video and telephone conferencing, mobile phones, portable media players, handheld computers, audio devices, microphones, loudspeakers, headphones and headsets, namely, software to control and improve audio equipment sound quality and for operating, installing, testing, diagnosing and managing devices for wireless transmission of acoustic information; downloadable electronic publications in the nature of e-papers, e-books, brochures and newsletters in the field of sound; cases adapted for electronic devices in the nature of mobile phones, portable media players, handheld electronic devices, computers; software for automated operating, installing, testing, diagnosing and managing of transmitters of sound, video and acoustic data