Electrical, electronic, signal and monitoring instruments, namely, instruments for receiving, transmitting and reproducing audio signals, namely, audio receivers and audio transmitters; high-frequency receivers, high-frequency input modules, [ instruments for recording and reproducing sound signals, namely, tape recorders and digital storage recorders; ] instruments for wireless transmission of acoustic information, namely, wireless microphone transmitters, plug-in microphone wireless transmitters, plug-in wireless microphone receivers; [ computer software for controlling, tuning, monitoring and demonstrating signal transmission on CD ROMs, disks, tapes, DVDs; ] [ identifiable guide systems comprised of sound signal receivers, audio transmitters and headphones for providing verbal information in single or multiple language format; ] instruments for broadcasting, transmitting and receiving sound signals or video signals, namely, high-frequency sound transmission instruments and sound transmission engineering instruments, namely, pocket transmitters and pocket receivers for the UHF [ and VHF ] ranges; diversity receivers, small receivers; [ live news coverage instruments, namely, broad band transmitters with command receivers, backward channel transmitters, diversity program receivers, command transmitters; antennae; ] instruments for narrow-band and broadband systems in sound transmission engineering; transmitters, namely, multichannel transmitters and singel-channel transmitters, [ infrared transmitters, receivers, namely, multichannel, single-channel and two-channel receivers; ] headphone receivers; [ chin-strap receivers and parts thereof; ] [ instruments for sound transmission and sound reproduction, namely, infrared and high-frequency transmitters and receivers, namely, mono-receivers, stereo receivers, two-channel receivers, and chin-strap receivers, listening and speaking fittings, conference and interpretation systems comprised of analog and digital transmitters of audio signals, video signals and data signals; instruments for communications engineering systems, namely, communication headset and headphones for use in conferences and simultaneous translations for use in all areas of telecommunications, airlines and air traffic control, news reporting and military communications; ] microphones, namely, dynamic microphones, condenser microphones, electret microphones, headset microphones, gooseneck microphones, directional tube microphones, wireless microphones, clip-on microphones, microphones with integrated transmitters, namely, [ condenser microphones with built-in high-frequency transmitters, ] soloist microphones, pressure microphones, switchable microphones, interface microphones and parts thereof, namely, microphone modules effected through computer aided acoustic design and laser interferometry techniques, [ microphone diaphragma, capsules, omni-directional electret capsules, oni-directional foil elec-tret capsules, microphone terminal distributors, ] microphone sleeves [ ; electroacoustic transducers, namely, headphones, dynamic headphones, electrostatic headphones, wireless headphones, headphones for use in aircraft, buses and trains, namely, with infrared transmission or high-frequency transmission, headphones with active noise compensation, loud speakers, parts and accessories for electroacoustic transducers and headphones, namely, ear pads, volume controls, amplifiers, namely, high-end and tube amplifiers, battery plugs, plug charging devices, connection cables, co-axial cables, adaptor cables, electrical cables, fiber optic cables ]