Headphone amplifiers; Headphone consoles; Headphone-microphone combinations; Headphones; Headphones for audio apparatus; Headphones for microphones; Stereophonic headphones; Stereo headphones; Covers for electric outlets; Covers for headphones; Covers for personal digital assistants (PDAs); Covers for smartphones; Covers for tablet computers; Anti-dust headsets; Cases adapted for batteries; Cases adapted for binoculars; Cases adapted for cameras; Cases adapted for cells; Cases adapted for computers; Cases adapted for contact lenses; Cases adapted for electric circuits; Cases adapted for electronic circuits; Cases adapted for electronic components; Cases adapted for mobile phones; Cases adapted for music recordings; Cases adapted for optical equipment; Cases adapted for photographic apparatus; Cases adapted for photographic equipment; Cases for smartphones