Devices and instruments for receiving, transmitting and reproducing audio signals, namely, audio transmitters and parts thereof, reception devices, namely, RF receivers; [ and RF input modules; ] instruments for receiving, transmitting and reproducing audio signals and acoustic information, namely, audio transmitters and audio receivers; apparatus for wireless transmission of acoustic information, namely, wireless microphone transmitters, plug-in microphone wireless transmitters; [ plug-in microphone receivers; ] identifiable guide systems, also multilingual, comprised of sound signal receivers for museums, exhibitions, theaters and other public events; electroacoustical and guide systems, comprised of transmitters, receivers, sound signal receivers and headphones; high frequency sound transmission apparatus, namely, infrared and high frequency transmitters and receivers, sound transmission engineering apparatus, namely, pocket transmitters, pocket receivers, receivers for UHF; [ and UHV ranges and parts thereof; ] [diversity receivers, small receivers, broad band transmitters with command,] [ live news coverage apparatus, ][ namely, broadband transmitters with command receivers,] [ backward channel transmitters, diversity program receivers, ] [command transmitters, headphones, microphones, electroacoustical transducers, amplifiers; computer software recorded] [ on tapes, ] [CD-ROMs] [ floppy discs and DVD disks ][for controlling, tuning, monitoring and demonstrating signal transmissions;] apparatus for audiology engineering, namely, assistive listening devices, namely, hearing amplifiers, infrared transmitters and receivers, all for the aforementioned goods not for the deaf