Batteries; Earbuds; Headphones; Megaphones; Microphones; Spectacles; Battery chargers; Bone conduction earphones; Chargers for batteries; Electronic memories; Horns for loudspeakers; Lithium ion batteries; Memory modules; MP3 players; Noise cancelling headphones; Personal headphones for sound transmitting apparatuses; Smart glasses; Stereo headphones; Virtual reality headsets; Wireless headphones; Wireless headsets for smartphones; Wireless speakers