[ Acoustic conduits; Audio-receivers and video-receivers; ] Earphones; Earphones and headphones; Headphones; [ Loudspeakers; Microphones; Portable media players; Protective covers for smartphones; Rechargeable batteries; Rechargeable electric batteries; Smart watches; Sound recording apparatus; Sound reproduction apparatus; Sound transmitting apparatus; Wearable activity trackers; ] Wireless headsets for smartphones [; Cabinets for loudspeakers ]