Communications headsets for use with communication radios, intercom systems, or other communications network transceivers

circuit boards and Integrated Circuits (IC) chips

Public-address systems consisting of microphones, loudspeakers, CD players, [ audio cassette players, ] equalizers, audio amplifiers, DVD players, and audio mixers

Public-address systems consisting of microphones, loudspeakers, CD players, audio cassette players, equalizers, audio amplifiers, DVD players, and audio mixers

PUBLIC ADDRESS SYSTEMS COMPOSED OF MICROPHONES, CD PLAYERS, AUDIO CASSETTE PLAYERS, EQUALIZERS AND AUDIO MIXERS

telecommunications services, namely, a telephone calling plan