Antennas; Apparatus for transmission of communication; Audio-video receivers; Audio interfaces; Cabinets for loudspeakers; Earphones and headphones; Electrical pickups for use with musical instruments; Headphones; Loud speakers; Masts for wireless aerials; Megaphones; Microphones; Modems; Portable media players; Set-top boxes; Virtual reality glasses; Walkie-talkies; Audio mixers; Sound mixers