Antennas; Intercoms; Loudspeakers; Microphones; Audio amplifiers; Audio cables; Headsets for mobile telephones; Microphone boom pole; Microphone cables; Microphone modules; Microphone stands; Motorcycle helmets; Mounts and mounting brackets adapted for audio speakers with swiveling bases therefor; Sound boards; Sound equalizers and crossovers; Sound filters made of cloth, for radio apparatus; Sound mixers with integrated amplifiers; Sound recording apparatus; Sound systems comprising remote c...