Antennas; Earbuds; Microphones; Walkie-talkies; Acoustic conduits; Adapter plugs; Communications headsets for use with communication radios, intercom systems, or other communications network transceivers; Earphones and headphones; Electric cables, wires, conductors and connection fittings therefor; Electric wires; Motorcycle helmets; Personal headphones for use with sound transmitting systems; Protective ear covering shields; Speaking tubes; Wireless speakers