Microphones, receivers, namely audio receivers, video receivers, and stereo receivers, transmitters, namely audio transmitters and radio transmitters, public address amplifiers, audio amplifiers, car amplifiers, radio receivers and tuners, equalizers, audio tape players and recorders, megaphones, horn speakers, speakers, namely audio speakers and loudspeakers; mixers, DVD/CD players; discussion system comprising microphones, audio speakers and loudspeakers, amplifiers, booster units, electric...