Batteries; Headphones; Loudspeakers; Microphones; Spectacles; Audio-video receivers; Bone conduction earphones; Electronic memories; Headsets for mobile telephones; Microphones for communication devices; Portable media players; Sound recording apparatus; Sound transmitting apparatus; USB dongles being wireless network adaptors; Wireless adapters for computers; Wireless high definition multimedia interface adapters; Wireless transmitters and receivers; MP3 players