ELECTRICAL, ELECTRONIC, OPTICAL, MEASURING, SIGNALING AND MONITORING APPARATUS, IN PARTICULAR, FOR RECEIVING, TRANSMITTING, AND REPRODUCING AUDIO SIGNALS, NAMELY, TRANSMITTERS AND RECEPTION DEVICES CONSISTING OF RF RECEIVERS, RF INPUT MODULES; ELECTRICAL APPARATUS IN ELECTROACOUSTICS AND PARTS THEREOF, NAMELY, DEVICES AND INSTRUMENTS FOR RECEIVING, TRANSMITTING AND REPRODUCING AUDIO SIGNALS AND ACOUSTIC INFORMATION, NAMELY, MICROPHONES, FILTERS FOR NOISE REDUCTION; BATTERY CHARGERS AND PARTS THEREFOR; ELECTRICAL POWER SUPPLIES; SIGNAL PROCESSORS; ELECTROACOUSTIC TRANSDUCERS; HEADSETS; EARPHONES; LOUDSPEAKERS; STEREO AND SOUND AMPLIFIERS; APPARATUS FOR THE TRANSMISSION OF AUDIO AND VIDEO SIGNALS, NAMELY, WIRELESS TRANSMITTERS, POCKET TRANSMITTERS, DIVERSITY RECEIVERS, ANTENNAE; OPERATOR TELEPHONE HEADSETS WITH AND WITHOUT ACTIVE NOISE COMPENSATION; SOUND-PROOFING HEADPHONES; APPARATUS FOR THE WIRELESS TRANSMISSION OF ACOUSTIC INFORMATION, NAMELY, POCKET TRANSMITTERS, POCKET RECEIVERS, DIVERSITY RECEIVERS, BROAD BAND TRANSMITTERS WITH COMMAND RECEIVERS, BACKWARD CHANNEL TRANSMITTERS, DIVERSITY PROGRAM RECEIVERS, COMMAND TRANSMITTERS; COMPUTER SOFTWARE, NAMELY, CONTROLLING, DEMONSTRATION AND PROMOTIONAL SOFTWARE FOR THE ABOVE MENTIONED GOODS ON FLOPPY DISKS, CD-ROMS AND DVD DISKS; FIBER OPTIC AND ELECTRICAL CABLES